The following words have unique character repeat patterns. More here.
aa
geggee
deedeed
anapanapa
sissiness
couscousou
recercelee
Wallawalla
eyelessness
Mississippi
taratantara
kinnikinnick
possessoress
preserveress
ceaselessness
consenescence
intestineness
possessedness
protoproteose
senselessness
chincherinchee
indivisibility
nonengineering
relentlessness
scintillescent
sleevelessness
stresslessness
unsensuousness
antinationalist
catallactically
defenselessness
dermatoglyphics
imprevisibility
insensitiveness
noncommencement
successlessness
superprosperous
unsweetenedness
inconsistentness
intertrinitarian
noninvincibility
osteoperiostitis
parallelepipedal
philophilosophos
proappropriation
secondhandedness
trigonocephalous
unassessableness
unprosperousness
anthroposociology
antiagglutinating
coracoprocoracoid
disinterestedness
dissentaneousness
feebleheartedness
interindependence
microcolorimetric
prepossessingness
proctocolonoscopy
pterygomandibular
semireverberatory
sulphophosphorous
superregenerative
supersensuousness
transportationist
unrepresentedness
anticentralization
antidisciplinarian
antiecclesiastical
antivaccinationist
astragalocalcaneal
calcaneoastragalar
consciencelessness
erythrocytoschisis
expressionlessness
galvanoplastically
indiscriminatingly
possessionlessness
pseudoconglomerate
Saccharomycetaceae
superconsciousness
supersensitiveness
unaccommodatedness
undiscriminatingly
unostentatiousness
zygomaticosphenoid
ambilateralaterally
autotransplantation
cholecystoileostomy
coinstantaneousness
craniorhachischisis
extraterritoriality
hyperinsulinization
impossibilification
irreprehensibleness
osteochondrofibroma
otorhinolaryngology
overindividualistic
pseudohallucinatory
semiantiministerial
superacknowledgment
uncomprehensiveness
unconscientiousness
unprepossessingness
vicissitudinousness
anthropomorphization
antianthropomorphism
antitintinnabularian
Archaeopterygiformes
characteristicalness
Chlamydobacteriaceae
epididymodeferential
hyperphosphorescence
indigotindisulphonic
indistinguishability
institutionalization
internationalization
oophorosalpingectomy
ophthalmothermometer
otorhinolaryngologic
palaeometeorological
physicophilosophical
predisadvantageously
pseudoconglomeration
pseudoparenchymatous
semiprofessionalized
spondylotherapeutics
stereophotogrammetry
superserviceableness
thoracogastroschisis
undiscriminatingness
ureterosigmoidostomy
anthropomorphological
anticonstitutionalist
cholecystolithotripsy
constitutionalization
counterinterpretation
counterpronunciamento
cryptocrystallization
deintellectualization
duodenocholedochotomy
electroencephalograph
hexachlorocyclohexane
indistinguishableness
mandibulosuspensorial
microcolorimetrically
otorhinolaryngologist
pentamethylenediamine
pharmacoendocrinology
pharyngoepiglottidean
poluphloisboiotatotic
prostatovesiculectomy
pseudoanthropological
pseudohermaphroditism
psychophysiologically
transubstantiationite
anatomicophysiological
blepharoconjunctivitis
cholecystenterorrhaphy
choledochoduodenostomy
counterexcommunication
dacryocystosyringotomy
electrotelethermometer
hexamethylenetetramine
hexanitrodiphenylamine
historicocabbalistical
naphthylaminesulphonic
nonrepresentationalism
omnirepresentativeness
pancreaticogastrostomy
philosophicohistorical
photochronographically
pneumoventriculography
polioencephalomyelitis
Prorhipidoglossomorpha
scleroticochorioiditis
stereophotomicrography
theologicoastronomical
thyroparathyroidectomy
anthropomorphologically
blepharosphincterectomy
epididymodeferentectomy
formaldehydesulphoxylic
gastroenteroanastomosis
hematospectrophotometer
macracanthrorhynchiasis
pancreaticoduodenostomy
pathologicohistological
pericardiomediastinitis
phenolsulphonephthalein
philosophicotheological
Pseudolamellibranchiata
pseudolamellibranchiate
scientificogeographical
thymolsulphonephthalein
transubstantiationalist
formaldehydesulphoxylate
pathologicopsychological
scientificophilosophical
tetraiodophenolphthalein
thyroparathyroidectomize