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Words ending with IN (9-letter)

A curated list of 9-letter words tailored to this exact pattern. Endings like IN often mark word families—helpful to confirm tense or morphology. For example: aflatoxin, allantoin, allethrin.

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118 words
Word Definition Length Syllables
aflatoxin94
allantoin93
allethrin93
amygdalin94
amylopsin94
antiauxin93
antimycin94
antitoxin94
antivenin94
appertain93
ascertain93
baldachin93
bilirubin94
birdbrain92
boatswain92
bromelain93
candlepin93
capsaicin93
cathepsin93
celloidin93
chatelain93
checkrein92
chieftain92
chilblain92
chinkapin93
chromatin93
cisplatin93
cobalamin94
cocaptain93
constrain92
cytokinin94
cytolysin94
cytotoxin94
digitalin94
digitonin94
digitoxin94
disseisin93
disseizin93
duralumin94
eledoisin94
endorphin93
endotoxin94
entertain93
eyestrain92
flagellin93
forebrain93
francolin93
grimalkin93
grosgrain92
harlequin93
hemolysin94
hifalutin94
hindbrain92
hobgoblin93
indigotin94
kanamycin94
kilderkin93
lamebrain93
laminarin94
luciferin94
mannequin93
melatonin94
merbromin93
metheglin93
mitomycin94
mujahedin94
mycotoxin94
myoglobin93
ninhydrin93
nonvirgin93
oleoresin94
onionskin93
ovalbumin94
overtrain93
oxacillin94
palanquin93
pellagrin93
peneplain93
phenytoin93
polymyxin94
porcelain93
porphyrin93
preordain92
progestin93
prolactin93
properdin93
puromycin94
pyrethrin93
pyroxylin94
quercetin93
rhodopsin93
ribavirin94
saccharin93
sannyasin93
sapogenin94
saxitoxin94
scarfskin92
sclerotin93
serotonin94
sharkskin92
sheepskin92
snakeskin93
spillikin93
superlain93
superthin93
sympathin93
tarpaulin93
tearstain92
threadfin92
tretinoin93
tyrocidin94
ultrathin93
uncertain93
underlain93
underspin93
vasotocin94
washbasin93
yellowfin93

FAQs

What’s typical about IN-ending words?
IN often marks suffix families; think about derivatives when guessing.

Do you include UK/US spellings?
Where they exist, both may appear.