The simplest pluralizer according to English rules. It doesn't contain a list of exceptions, so it will return 'mouses' instead of 'mice', 'mans' instead of 'men', etc.

basic-plural.js

module.exports = function getPlural(name) {
    const match = (r, n, e) => r.test(name) && (n ? name.slice(0, -n) : name) + e;
    return match(/sis$/, 2, 'es') // analyses, diagnoses
        || match(/(?:[^fgmq][aeoi]|[fglm][eio]|[^aeijoqsuvxz])s$/, 0, '') // physics, stairs
        || match(/(?:s|x|z|[cs]h|ato)$/, 0, 'es') // kisses, tomatoes
        || match(/(?:[^aeiou]|qu)y$/, 1, 'ies') // ladies, tries
        || match(/[^ch][ieo][ln]ey$/, 2, 'ies') // smilies, monies
        || match(/(?:[aeou]l|[eo]a|ar)f$/, 1, 'ves') // scarves, shelves
        || match(/[^defr]ife$/, 2, 'ves') // knives, wives
        || name + 's';
}

package.json

{
  "name": "basic-plural",
  "version": "1.0.0",
  "description": "",
  "author": "Artem Avramenko",
  "license": "MIT",
  "dependencies": {
    "pluralize": "^8.0.0"
  }
}

test.js

const pluralize = require('pluralize')
const getPlural = require('./basic-plural');

let words = `
aardwolf
abacus
abatis
abattis
abbess
abcs
abducens
abies
ability
abortus
abrasive
abraxas
abruptness
abscess
abstractness
abstruseness
absurdness
abuse
abyss
acanthus
acarus
accelerando
access
accomplice
accroides
achimenes
acidophilus
acidosis
acinaces
acinus
acontias
acoustics
acres
acridness
acrobatics
acropolis
across
actinomyces
activeness
activity
actress
aculeus
acuteness
adagio
additive
address
adenitis
adeps
adhesiveness
adios
adjective
ado
adobo
adonis
adroitness
adulteress
adventure
adventuress
aegilops
aegis
aepyornis
aerides
aerobatics
aerobics
aerodynamics
aeromechanics
aeronautics
aerostatics
aesthetics
aetites
affairs
afficionado
afflatus
aficionado
afro
afterlife
afterpains
afters
aftershave
agapanthus
agenesis
agio
agonistics
agrafe
agraffe
agronomics
aids
aikido
ailanthus
airbus
airiness
airs
airwave
akinesis
alans
albedo
albino
alderney
alexanders
alferes
alisanders
alkermes
allegretto
alley
allhallows
allies
allis
alloquy
allusiveness
ally
alms
aloes
aloofness
alphabetics
alphanumerics
altissimo
alto
altocumulus
altostratus
alumnus
alveolus
alzheimers
amanuensis
amaretto
amaryllis
amass
ambages
ambiloquy
ambo
amends
amenities
amice
amigo
amino
amiss
amnio
amnios
amorousness
amphioxus
anabas
anacamptics
anaclastics
anaglyptics
anagrams
analects
analysis
analytics
anamnesis
anamorphosis
ananas
anas
ancestress
ancestry
ancients
androides
anestrus
angelus
animatronics
animus
anklets
ankus
ankylosaurus
annals
anniversary
annulus
anoestrus
anomalops
anomaly
antares
anthesis
antiloquy
antineutrino
antipasto
antiphrasis
antipodes
antipyresis
antisepsis
antithesis
antitrades
anus
anxiousness
aortitis
apatosaurus
aphesis
apologetics
apology
apoptosis
apotheosis
apparatus
appendicitis
appro
apsis
aptness
aquatics
arbovirus
arbutus
arccos
arch
archduchess
archimedes
archipelago
architectonics
archive
archives
archness
arcus
arduousness
aretaics
argas
argus
aries
arioso
arles
armadillo
arms
arpeggio
arquebus
arras
arrears
arroyo
arteritis
artfulness
arthritis
artlessness
arts
asbestos
ascites
asclepias
ascus
ashes
asparagus
asperges
ass
assets
assizes
asterias
astragalus
astrodynamics
astronautics
astrophysics
ateles
atherosclerosis
athetosis
athletics
atmospherics
attagas
attorney
auntie
aurochs
auspices
authentics
authoress
authorities
authority
auto
autobus
autogenics
autogiro
autogyro
auxesis
ave
avens
avionics
avitaminosis
avo
avocado
avoirdupois
awareness
awfulness
axe
baas
baboo
baby
backstairs
backwoods
badderlocks
badlands
bagnio
bailey
balas
balbuties
balcony
ballistics
ballyhoo
baloney
balusters
bambino
bamboo
banjo
bank
banns
bar
barbadoes
barbiers
barley
barras
barrels
barrio
bars
barytes
base
basics
basso
batatas
bath
bathos
battery
bays
bbs
beach
beads
beam
beano
beatniks
beats
beau
beauty
bedclothes
bee
beehive
beestings
beeves
behalf
believe
bellows
belongings
bends
benthos
bias
bibliotics
biceps
bifocals
bigos
bikers
bilges
billiards
bimbo
bingo
binoculars
biodynamics
bioethics
biometrics
bionics
bionomics
biophysics
biostatics
biostatistics
biosystematics
bistro
bitters
black olive
blahs
blarney
bleachers
blewits
blinks
bloodulf
bloodybones
bloomers
blues
bluff
boards
bobbysocks
bolero
boley
boloney
bomb
bones
bongo
bonito
bonobo
bonus
boo
booby
book
bookie
bookshelf
boomdas
boondocks
bootboys
bootes
boots
bordello
boreas
bos
bouffe
bounds
bourgeoisie
bowels
bowls
box
boxcars
boxers
boxershorts
boy
bozo
bps
bracero
braces
braggadocio
brakes
branks
brassets
bravado
bravo
breakers
breeches
breeze
brew
briefs
brio
britches
broncho
bronco
brownie
brush
brussels
bubo
buceros
buckaroo
buckskins
budgie
bufo
bugaboo
bunco
bunko
buns
bureau
burgoo
burrito
burro
bus
busses
butterfingers
buttocks
button
buttons
bygones
cabas
cabby
cacao
cacoethes
cacogenics
cactus
cadrans
caecias
cafe
calf
calico
calisthenics
callisthenics
callus
calorie
calypso
cameo
cameralistics
campus
canderos
candlepins
canoe
canopy
canto
canvas
capias
capo
captive
carafe
carcavelhos
carcinosys
cards
career
cargo
caries
carney
carnivore
carny
carve
case
casino
castanets
cat
catadioptrics
catallactics
cataphonics
catechetics
category
cates
catholicos
catoptrics
cattle drive
cave
cavetto
cello
census
centas
centavo
centiloquy
century
ceramics
ceras
cerastes
ceraunics
ceremony
ceres
cero
ceroplastics
cgs
chaetetes
chafe
chains
chair
channels
chaos
charades
charge
charlie
charras
chasselas
chateau
checkers
cheer
cheerio
cheese
chef
chequy
chermes
cherry
chiaroscuro
chicano
chief
chilblains
chimney
chino
chips
chirp
chitlings
chitlins
chitterlings
chive
chives
chlamys
chlorpyrifos
chrematistics
chreotechnics
christmas
chromatics
chuddies
chupacabras
church
churidars
chutney
ciao
cicero
cilantro
cinema
circumstances
circus
cisco
city
civics
civies
civvies
cladistics
clams
clappers
class
classes
classics
cleaners
cleats
cleavers
clews
clidastes
clivers
clock
clocks
clothes
clue
clumps
clutches
coach
coatdress
cobblers
cobra
cockatoo
cockney
coco
cocobolas
coevals
coffee
coho
cokes
collards
collective
colley
collie
collins
colloquy
collywobbles
colony
colors
colours
colugo
combo
comedo
comes
comforts
commando
commons
communications
company
compasses
compliments
concerto
conditions
condo
coney
confines
congeries
congo
congratulations
conics
consensus
conserves
constructor
consultancy
contemporaries
contents
contralto
contraries
contretemps
conveniences
coo
cookie
copperas
copps
cops
copy
coralbells
cords
corduroys
corf
corozo
corporas
corps
corpse
corrections
cos
cosmos
cossas
costs
cough
country
courthouse
cove
cover
cows
cps
crab
crabs
cracklings
craft
crampoons
crants
craps
crash
crawly
crayon
creamcups
credentials
credits
credo
creeps
cremains
crems
crescendo
crisis
crispness
crossbones
crosshairs
crossroads
crosstrees
crowbar
crows
croys
crudites
cruise
crust
cryogenics
cryonics
cryptanalytics
cuckoo
cuff
curio
currency
curry
customs
custos
cutie
cybernetics
cycas
cyclas
cyclops
cynegetics
cyphonautes
cypres
cytoarchitectonics
cytogenetics
dado
dago
daimio
dalmanites
dalo
damages
daroo
dartars
dartos
darts
das
database
day
days
dealings
deas
death
deco
decrescendo
dedans
deeds
dees
dehors
deinoceras
dekko
delf
deloo
delta
demiwolf
demo
demon
dentiloquy
deputy
derbio
dermatoglyphics
dermestes
descendants
deserts
desperado
details
detective
devices
devoto
diabetes
diabley
diacoustics
diagnosis
diagnostics
diagraphics
dialectics
diaphonics
dibs
dickens
didactics
diddley
dido
dietetics
diggings
digs
dilapidations
dildo
dilemma
diminuendo
dinero
dinichthys
dinoceras
diogenes
dioptrics
diploma
dipsas
direction
disco
dish
distringas
ditto
dive
divertimento
dives
do
dodo
doggy
dogmatics
doings
doko
doldrums
domino
dominoes
dominos
donkey
doo
dorado
doryphoros
doubles
dove
dowlas
doyley
dozens
draco
dramatics
draughts
drawers
dregs
drimys
drink
drippings
drive
drongo
droppings
druthers
dryas
drygoods
dryobalanops
duckpins
duds
duettino
duetto
dulciloquy
dumplings
dumps
duo
duodecimo
duomo
durables
durio
duty
dvarf
dwarf
dyas
dye
dynamics
dynamo
dysgenics
earnings
eats
eave
eaves
ebonics
econometrics
economics
eddo
effects
effigies
eggs
egilops
ego
eidos
eighteenmo
eighties
eightvo
ejoo
elaps
eldorado
electro
electromagnetics
electronics
electrostatics
elements
elf
elops
elves
embargo
embroglio
embryo
emphasis
employ
employee
emprosthotonos
emu
encephalartos
encephalos
enclitics
encyclopedia
endodontics
energetics
enhydros
ens
enterics
enterprise
entrails
entremets
environs
eos
epanodos
ephialtes
epigraphics
epispadias
epitithides
epos
erato
erf
ergonomics
eringo
erinys
ermines
eros
ers
eryngo
erysipelas
escambio
escudo
eskimo
esoterics
esparto
espresso
esthetics
ethics
ethiops
ethnos
ethos
eudaemonics
eudemonics
eugenics
eurhythmics
euro
eurythmics
euthenics
eve
evectics
evolve
ex
executive
exegetics
exequy
exodontics
exomphalos
exophthalmos
explanans
explosive
expo
extrados
eyas
eye
eyeglasses
eyes
face
facies
factory
fado
faeces
faerie
fagotto
falls
falsetto
falsy
faluns
family
fandango
fantasticco
fantasy
fantods
farandams
faro
farrago
fasces
fatigues
fatso
fauces
favas
fave
favela
favosites
favourite
fax
feces
fecks
fee
feelings
fellatio
felony
fenks
ferretto
ferrugo
fetus
fiants
fiasco
fiberoptics
fibreoptics
fico
fidalgo
fides
fifo
fifties
figaro
filipino
fils
finances
findings
fingrigo
finish
finocchio
finochio
fisticuffs
fives
fix
fixings
fizz
flamenco
flamingo
flaps
flats
flauto
flea
flies
flinders
flo
floaty
flow
flower
flush
fly
flyer
fo
foam
focus
folio
folks
follies
follower
followers
fomes
foodie
foot
footlights
footsie
force
forceps
forensics
formalities
formula
forties
fortissimo
forum
fracas
fracho
freemasons
fresco
fricando
friend
fries
frijolillo
frijolito
frons
fubs
fuchs
fuero
fugato
fugitive
fumes
funambulo
fundamentals
funds
fungus
funnies
fustilugs
futuristics
gabbro
gaffe
galago
galeas
galimatias
galley
gallows
galwes
gambadoes
garbanzo
garganey
gas
gastriloquy
gastromyces
gasworks
gate
gateau
gaucho
gaywings
gazebo
gazpacho
gecko
gems
gene
general
generalissimo
genesis
genethliacs
genetics
genie
genitals
genius
genomics
gens
gentoo
genus
genys
geodetics
geographics
geophysics
geopolitics
geoponics
geriatrics
gesso
ghetto
gibbartas
giblets
gift
gigolo
gimbals
gingko
ginkgo
ginzo
giraffe
girl
giro
gismo
gitano
gives
gizmo
glanders
glans
glass
glasses
glassworks
glissando
glove
glyptics
gnomonics
go
goalie
goaves
gobs
goggles
goldfields
goldilocks
goldney
goldylocks
golf
golyardeys
gombo
gonys
goo
goodwife
gooney
goonie
gooroo
goose
gorilla
gps
graffito
grains
gramps
grandma
graphics
grave
gravitas
greatness
greaves
greens
grego
gres
gringo
gripes
grissino
grits
groats
groove
gros
grotto
grounds
groupie
grow
guacharo
guaco
guanaco
guano
gubbins
guelf
guess
guest
gules
gulf
gulyas
gumbo
gurney
gusto
guts
guy
gymnastics
gyro
gyrostatics
haaf
hackles
hackney
hades
haemadynamics
haemastatics
haematocolpos
hairdo
half
halieutics
halloo
halo
hals
halteres
halves
halysites
hamadryas
hammochrysos
handkerchief
hands
hanky
hanselines
hao
hardheads
harmonics
harp
hauls
hautpas
haves
headquarters
heaps
hearts
heartstrings
heat
heavens
heaves
heights
helamys
hello
hemadynamics
hemastatics
hematocolpos
hemodynamics
hendiadys
hercules
hermeneutics
hermes
heroics
herpes
hetero
heteroptics
hiccup
hidalgo
hiems
high
hijinks
hindoo
hindquarters
hippie
hippies
hippo
hippocras
hippocrates
hippopotamus
hipps
hipsters
hirudo
hirundo
history
histrionics
hive
hives
hmo
ho
hoax
hobby
hobo
hocco
hogo
hogtie
holethnos
hollands
hollo
holmos
homiletics
hommos
homo
honcho
honey
honeybells
honours
hoodoo
hooks
hoopoo
hoops
hopperings
hoppo
hops
hornfels
hornito
horseshoes
hostilities
hotcockles
hots
hoummos
hours
house
housefly
houselights
housewife
huanaco
huaraches
hullabaloo
hullo
human
humanics
humanities
humans
hunks
hurdles
hurds
hurricano
hurries
huso
hustings
hydramnios
hydraulics
hydrodynamics
hydrokinetics
hydromechanics
hydroponics
hydrops
hydrostatics
hygienics
hygrostatics
hylodes
hymeneals
hypo
hypospadias
hysterics
icaco
ichthys
ideographics
ides
igloo
iliopsoas
imago
imbargo
imbrocado
imbroglio
impasto
impatiens
imperiousnes
impetigo
impoofo
impresario
inamorato
incentive
incienso
index
indigo
indoles
indulto
industry
inferno
info
informatics
ingluvies
innards
innings
innuendo
instructions
intaglio
intermezzo
internuncio
intertrigo
intrados
intro
inuendo
io
ipo
ipocras
irenics
ironheads
irons
ironworks
irs
is
isagogics
isometrics
issue
ixodes
jaboncillo
jackanapes
jacks
jackstones
jackstraws
jakes
jako
jalapeno
jambes
jammies
jards
jeames
jefe
jello
jenkins
jiao
jigaboo
jimmies
jingo
jinks
jippo
jitney
jitters
jo
jodhpurs
johannes
johnadreams
jollies
joso
jougs
journey
judas
judge
judo
juglans
junco
junkie
junto
justico
kakapo
kakemono
kalantas
kalends
kangaroo
karatas
karreo
kattinumdoo
kayak
kayko
kayo
kazoo
keno
keramics
kerf
kermes
kers
key
kickshaws
kiddo
kidney
kiley
kilo
kimono
kinematics
kinesiatrics
kinesthetics
kinetics
king
kino
kirumbo
kiss
kiwi
klepto
klipdachs
klipdas
knickerbockers
knickers
knife
knob
knockings
knockoff
knucklebones
knuckles
knucks
ko
koala
kobo
koodoo
kos
kosmos
koto
kousso
krems
kudos
kyley
laas
lace
laches
ladino
lady
laelaps
lagophthalmos
lakao
lalo
lampas
lampers
lancers
land
langley
language
lanterloo
lanugo
lap
larghetto
largo
las
lashings
lassie
lasso
lates
latino
lats
laurels
lavabo
laxative
lazaretto
lazybones
leaders
leaf
leaves
lees
leftovers
legs
lemon
leno
lens
lentigo
leo
leotards
lepas
leptomeninges
les
letters
leucoethiops
lexicostatistics
ley
liabilities
liar
lias
libido
libretto
license
lido
lie
life
lifo
lights
lilo
lilyturf
limbers
limbo
limo
limoges
lingo
linguistics
links
lino
litas
lithochromatics
lithochromics
lithoglyptics
lithops
litotes
litre
liturgics
liturgist
livedo
lives
llanero
llano
loads
loaf
loaves
locao
loco
locofoco
locus
lodgings
loggerheads
logics
logistics
logo
logos
loins
lokorys
loligo
lolly
longlegs
longshanks
longways
loo
looney
loos
lophiomys
los
losings
losses
lothario
loto
lotos
lots
lotto
lotus
louse
love
low
low-life
lowlife
loxodromics
luau
ludo
lues
lumbago
macartney
machismo
macho
macro
macrobiotics
macroeconomics
madras
maestro
mafioso
mage
magnes
magnetics
magneto
magnetohydrodynamics
maieutics
mains
maithes
majors
mako
male
mallows
mambo
mango
manifesto
manks
manners
mantelshelf
manyplies
maraschino
marbles
mars
marseilles
mass
massage
masses
materfamilias
mates
mathematics
mathes
maths
matins
mattages
matzo
maulers
mawks
mayo
means
measles
mechanics
medico
medics
medium
medley
megabucks
megaceros
megalops
megrims
melasses
melodics
melody
memento
memo
memoirs
memorandum
mends
meninges
menses
menu
mercenary
mercy
merils
merino
meros
mesdames
meshugaas
mesonephros
mess
messias
mestizo
metalworks
metamathematics
metanephros
metaphysics
metempirics
meteor
methodios
metrics
metro
metrosideros
mews
mezzo
mho
mias
microeconomics
microelectronics
microlestes
microphonics
midas
midlands
mikado
mikmaks
mile
milo
mimeo
minors
minos
minutes
miro
misanthropos
mishegaas
miso
mithras
mnemonics
mo
mockers
mods
mojo
molasses
mollities
molosses
monas
money
mongo
mongoos
mongoose
monkey
mono
monoceros
mons
moo
moolley
mooncalf
mopes
morals
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