Countable Nouns That End in OS

Explore 155 verified English countable nouns ending with the suffix -OS, including Cosmos, Ethos, Demos, Adios, Sos, Chinos and Rhinoceros. Useful for ESL grammar practice, determiner usage, and plural spelling and rhyming patterns, browse these count nouns with singular and plural forms below or review singular and plural count rules in our noun grammar guide.

Refine list...
JUMP:
Sort:
Group:
Case:
View:
JUMP TO:
Select any word to view available definitions & photosSelect any word for details
Starts with A17 words
adios
axios
atmos
aulos
azygos
aoidos
aryballos
anophthalmos
anigozanthos
askos
aepyceros
anodos
aegithalos
akolouthos
antigropelos
alalagmos
alloiostrophos
Starts with B4 words
bigos
balabos
bothros
buceros
Starts with C13 words
cosmos
cos
chinos
calvados
christos
catholicos
custos
chaparejos
chalkos
crios
chaparajos
criophoros
cephaleuros
Starts with D12 words
demos
dolichos
doos
didymos
diospyros
dromos
dolos
diceros
dipteros
diaulos
diadoumenos
dihelios
Starts with E18 words
ethos
enos
eidos
exodos
epos
exomphalos
ethnos
extrados
eleutherios
euarctos
epinaos
epikouros
emprosthotonos
enhydros
encephalartos
epiparodos
epanodos
episthotonos
Starts with G3 words
galapagos
gauchos
gros
Starts with H
2 words
huevos
heautontimorumenos
Starts with I
2 words
ios
intrados
Starts with K5 words
kos
kouros
kanjoos
kantharos
kottabos
Starts with L3 words
llanos
lekythos
lichanos
Starts with M10 words
mythos
maduros
microcosmos
monoceros
metanephros
mebos
metrosideros
megaloceros
mesonephros
monopteros
Starts with N3 words
nomos
naos
nostos
Starts with O8 words
os
ouroboros
omphalos
opisthotonos
orthros
ovibos
onos
opisthodomos
Starts with P20 words
pothos
parados
pharos
porthos
pithos
peplos
pronaos
parodos
pronephros
phos
peribolos
promachos
petasos
paranephros
periaktos
porphyrios
phorusrhacos
pseudoperipteros
proslambanomenos
philophilosophos
Starts with R7 words
rhinoceros
rooibos
reredos
renosterbos
rhodotypos
rhenosterbos
rhombos
Starts with S16 words
sos
sakkos
saros
stichos
skyphos
sekos
sparagmos
stamnos
symplocos
symphoricarpos
siglos
speos
sacerdos
sauroctonos
sicyos
sandastros
Starts with T10 words
thermos
taos
topos
telos
tournedos
tripos
temenos
tholos
tomos
threnos
Starts with V
1 words
vassos
Starts with X
1 words
xenos

•Browse Countable Nouns by Letter (A to Z)

Select an ending letter to browse countable nouns
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWordsVocabulary HubPositive WordsNegative Words
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.