Countable Nouns Ending in US and Containing O
This list gathers 574 English countable nouns ending in US and containing O, such as Focus, Religious, Bonus, Precious, Consensus, Coronavirus and Chorus. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.
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Starts with A
24 words autofocus
alveolus
adenovirus
adolphus
acidophilus
andronicus
arbovirus
autobus
altocumulus
allosaurus
ankylosaurus
apatosaurus
australopithecus
abortus
altostratus
aerobus
albertosaurus
anthropophagus
amphioxus
accessorius
artocarpus
antoninianus
adoretus
aegyptopithecus
Starts with B
21 words bonus
brontosaurus
bolus
bronchus
brachiosaurus
baculovirus
burnous
basilosaurus
broigus
boletus
bonasus
borborygmus
botulinus
bromus
bulbocavernosus
brosmius
bothriocephalus
bucorvus
botryllus
bonassus
brachistocephalus
Starts with C
24 words consensus
coronavirus
chorus
corpus
colossus
crocus
cytomegalovirus
croesus
coleus
cumulonimbus
corvus
cynomolgus
coxsackievirus
coccus
convolvulus
conus
conspectus
colobus
conatus
cirrostratus
crocodylus
conceptus
cornus
coryphaeus
Starts with D
24 words doofus
defocus
diplodocus
discobolus
diabolus
deinonychus
dilophosaurus
diplococcus
deltoideus
desmodus
dimocarpus
dupondius
dendroctonus
dunkleosteus
diaconus
dorotheanthus
dendrolagus
dikelocephalus
derodidymus
dictyograptus
dendrodus
dochmius
dermatonosus
dolichosaurus
Starts with E
24 words exodus
esophagus
embolus
enterococcus
enterovirus
euonymus
eohippus
echinococcus
elasmosaurus
epigonus
equinovarus
echovirus
edmontosaurus
edaphosaurus
electrobus
electrophorus
elephantopus
ephorus
eucinostomus
exocoetus
eleutherococcus
embolismus
exomphalus
enterobius
Starts with F
11 words focus
favonius
flocculus
filovirus
foederatus
floccus
fractostratus
fractocumulus
ferocactus
faveolus
fonticulus
Starts with G
11 words gladiolus
globus
glomerulus
gastrocnemius
goofus
giganotosaurus
gonococcus
glomus
gloydius
geophagus
glossopharyngeus
Starts with H
14 words hippopotamus
hippocampus
hypothalamus
homunculus
hocus
hadrosaurus
helleborus
hemionus
hyoscyamus
hoppus
hectocotylus
holodiscus
hydrosaurus
hircocervus
Starts with I
6 words intravenous
ignoramus
introitus
ichthyosaurus
ischiocavernosus
ichthyophthirius
Starts with J
1 words jacobus
Starts with K
1 words kinetonucleus
Starts with L
11 words lotus
locus
lactobacillus
lobus
loculus
lobulus
leptocephalus
leonurus
loranthus
leporinus
logodaedalus
Starts with M
24 words modulus
modus
microbus
malleolus
mosasaurus
megalosaurus
metapneumovirus
micronucleus
microvillus
momus
myoclonus
modiolus
meningococcus
misfocus
molossus
motorbus
morbus
micrococcus
modius
morbillivirus
myxovirus
macronucleus
mesohippus
monticulus
Starts with N
8 words norovirus
nucleolus
nonplus
nimbostratus
nodus
notocactus
nematodirus
novodamus
Starts with O
23 words octopus
opus
omnibus
onus
oculus
osmanthus
organophosphorus
oncovirus
overplus
overfocus
ocellus
obelus
ornithorhynchus
otocinclus
obliquus
orthomyxovirus
opinicus
oncornavirus
ozothamnus
opulus
octonarius
oncus
orthrosanthus
Starts with P
24 words precious
phosphorus
prospectus
potus
proteus
papillomavirus
poliovirus
parvovirus
pylorus
poxvirus
polyanthus
parasaurolophus
polypus
paranthropus
plecostomus
postbus
popliteus
paramyxovirus
peroneus
polyomavirus
provirus
propositus
pneumococcus
prefocus
Starts with Q
1 words quetzalcoatlus
Starts with R
16 words religious
rendezvous
refocus
rhombus
retrovirus
rhinovirus
rotavirus
rufous
rhoncus
reovirus
rhonchus
rosmarinus
rhabdovirus
rhomboideus
risorius
rhoicissus
Starts with S
24 words subconscious
sarcophagus
streptococcus
stegosaurus
solidus
staphylococcus
scabious
spinosaurus
stratocumulus
soleus
sartorius
socius
sorus
semichorus
sorbus
solvus
seismosaurus
strobilus
styracosaurus
sarcochilus
scholasticus
somniosus
strombus
sinanthropus
Starts with T
19 words torus
tyrannosaurus
trolleybus
thrombus
tropheus
tophus
togavirus
thiobacillus
tholus
therizinosaurus
trochus
tarsometatarsus
trochilus
trollius
tibiotarsus
trichostrongylus
thyroarytenoideus
totanus
trochiscus
Starts with U
2 words urceolus
uredosorus
Starts with V
1 words volvulus
Starts with X
7 words xenopus
xiphopagus
xanthocephalus
xyleborus
xenosaurus
xenorhynchus
xiphosurus
Starts with Z
10 words zygomaticus
zygocactus
zinjanthropus
zaglossus
zonurus
zoophagus
zophorus
zoophorous
zoophorus
zorotypus