About 400 commonly misspelled English words, in their misspelled form, limited to those words that could not plausibly be another word. (For example, "you're" and "your" are frequently confused, but neither appear here, because both are valid words.)

misspelled-words.txt

absance
absense
acceptible
accidentaly
accidently
accomodate
accordian
acerage
acheive
acknowlege
acommodate
acquaintence
acrage
adquire
adrenalin
adress
adultary
adviseable
advizable
aggresion
agression
aknowledge
alchohol
alege
alegiance
algorythm
allage
allegaince
allegience
allmost
alot
amatuer
amature
ammend
annualy
anually
aparent
apparant
aquaintance
aquire
aquit
arguement
artic
athiest
averege
avrage
aweful
awfull
axel
balence
ballance
basicly
becomeing
becuase
beggining
begining
behaviour
beleif
beleive
believeable
bellweather
bereu
bisness
bizness
bouy/bouyant
brocolli
buisness
burgler
bussiness
calender
camoflage
camoflague
carefull
carrer
Carribean
catagory
caugt
cauhgt
cematery
cemetary
changable
chauvanism
cheif
chocolatey
collaegue
collegue
colliseum
colum
comitted
comming
commited
committment
compitition
conceed
concensus
concieve
concious
confortable
congradulate
consciencious
consious
contraversy
conveniance
cooly
copywrite
critecize
critisize
dacquiri
Dalmation
daquiri
decaffinated
decathalon
decieve
definate
definately
definit
definitly
desireable
desparate
developement
diarrea
diety
diffrence
diffrent
dilema
disapoint
disasterous
dispell
dissappoint
drunkeness
dumbell
embarass
enviroment
equiptment
excede
excercise
exilerate
existance
experiance
expresso
exstacy
extreem
extremly
facinating
facist
Febuary
firey
flabberghast
flourescent
foriegn
fouty
freind
frustrum
fullfil
garantee
garanty
garentee
genious
goverment
grammer
gratefull
greatful
grievious
guage
guidence
hankerchief
harrass
heighth
heigth
heirarchy
hemorage
hieght
higeine
hipocrit
hiygeine
hors derves
humerous
hygeine
hygene
hygine
hym
ignorence
iland
imaginery
imediately
imitashun
immitate
immitation
inadvertant
inate
incidently
independance
independant
indispensible
innoculate
inteligence
intelligance
interuption
intresting
irrelevent
irresistable
irritible
jellous
jewelery
kernal
knowlege
lazer
liason
libary
liberry
liesure
lisence
maintainance
maintainnance
maintenence
maintnance
managable
marshmellow
medeval
medevil
mideval
milennium
millenium
miniture
mischeif
mischevious
mischevous
mischievious
mispell
misspel
mit
momento
monestary
monkies
morgage
mountian
neccessary
necessery
neice
nickle
nieghbor
nineth
ninty
noone
noticable
nuptuals
occasionaly
occassion
occassionally
occured
occurence
occurrance
ocurance
omision
ommision
oppurtunity
ordeurves
orignal
outragous
paralell
parliment
passtime
pasttime
pavillion
peice
percieve
perserverance
perseverence
personel
personell
persue
pertend
pharoah
pidgeon
pistacchio
plagerize
playright
playwrite
plentitude
pointsettia
posession
possesion
potatoe
potatos
preceed
preceeding
presance
presumptious
privelege
priviledge
professer
promiss
pronounciation
prufe
publically
quarentine
questionaire
questionnair
readible
realy
reccomend
reccommend
reciept
recieve
recieved
recomend
rediculous
referance
refered
refrence
refridgerator
reguardless
relevent
religius
religous
remeber
repitition
restarant
restaraunt
restrant
revelant
roomate
ryme
rythem
rythm
sacreligious
sargent
secratary
secretery
seiege
sensable
sentance
seperate
septagenarian
sieze
similer
similiar
sincerly
sorceror
speach
stragedy
succesful
successfull
sucessful
suggestable
supercede
superseed
supposively
suprise
surprize
thier
throughly
tomatos
tommorrow
tounge
triathalon
truely
twelth
tyrany
underate
untill
upholstry
useing
usible
usualy
vaccuum
vacume
vegatarian
vegeterian
vehical
villan
visious
welfair
wellfare
Wendesday
wether
wich
wierd
wilfull
withold
writeing 
writting

Some of the words in this list are actually correctly spelled, not misspelled -- for example, "there" is correctly spelled, as is "lead", "rime", etc.

Here's how you can generate a list of words that are actually correctly spelled:

╭── jxf@tesseract · 2013-06-07 · 13:57:36
│   /tmp
╰─▶ ψ wget https://gist.github.com/waldoj/5731016/raw/6d8a1812e4f784ea3d2be214827d9847d12d9957/misspelled-words.txt -O wrong-words.txt
--2013-06-07 13:58:24--  https://gist.github.com/waldoj/5731016/raw/6d8a1812e4f784ea3d2be214827d9847d12d9957/misspelled-words.txt
Resolving gist.github.com (gist.github.com)... 204.232.175.94
Connecting to gist.github.com (gist.github.com)|204.232.175.94|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/plain]
Saving to: ‘wrong-words.txt’

    [                                                   ] 3,684       --.-K/s   in 0s      

2013-06-07 13:58:24 (21.6 MB/s) - ‘wrong-words.txt’ saved [3684]


╭── jxf@tesseract · 2013-06-07 · 13:58:24
│   /tmp
╰─▶ ψ sort wrong-words.txt > sorted-wrong-words.txt

╭── jxf@tesseract · 2013-06-07 · 13:58:30
│   /tmp
╰─▶ ψ sort /usr/share/dict/words > sorted-dictionary-words.txt

╭── jxf@tesseract · 2013-06-07 · 13:58:34
│   /tmp
╰─▶ ψ comm -12 sorted-wrong-words.txt sorted-dictionary-words.txt

awhile
barbeque
breath
collectable
defiantly
effect
floatation
heros
lead
lightening
liquify
loose
miniscule
principal
rime
stationary
there
they're
ukelele

comm -12 file1 file2 finds all the lines in file1 that are also in file2, assuming the two files are both sorted (it is an error if they aren't).

:1

Hey. Where are my Markdown icons?

It's :+1:, if you meant to do 👍. :)