Countable Nouns Ending in IUM and Containing R
This list gathers 405 English countable nouns ending in IUM and containing R, such as Premium, Equilibrium, Aquarium, Consortium, Auditorium, Atrium and Bacterium. 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 aquarium
auditorium
atrium
anthurium
armamentarium
androecium
antheridium
archegonium
apodyterium
archaebacterium
anacardium
aerarium
arbitrium
appressorium
aprium
aspersorium
arctium
acroterium
apterium
androconium
anticlinorium
androsporangium
archesporium
avicularium
Starts with B
11 words bacterium
brachium
bucranium
bullarium
bronchium
brontotherium
botrychium
bothrium
bromatium
brimborium
botrydium
Starts with C
24 words consortium
crematorium
cranium
columbarium
clostridium
cryptosporidium
corium
criterium
cyanobacterium
conservatorium
ciborium
calvarium
cafetorium
charmonium
corynebacterium
caldarium
cinerarium
cladosporium
collyrium
centaurium
cephalosporium
ceratium
closterium
cypripedium
Starts with D
11 words delirium
disequilibrium
dolphinarium
dendrobium
deinotherium
desiderium
diphyllobothrium
digitorium
dinotherium
disciplinarium
drepanium
Starts with E
24 words equilibrium
emporium
endometrium
endocardium
epicardium
exordium
epineurium
eryngium
epigastrium
eupatorium
endoneurium
enterobacterium
eubacterium
excubitorium
elotherium
erythronium
eurotium
erodium
epicranium
exosporium
embothrium
endocranium
endoperidium
entomosporium
Starts with F
8 words freemium
fusarium
frigidarium
formicarium
florilegium
fumatorium
farfugium
flabellarium
Starts with G
3 words geranium
gymnatorium
graphium
Starts with H
18 words honorarium
harmonium
herbarium
hypochondrium
hydronium
heliotropium
haustorium
hypogastrium
horologium
helminthosporium
hydropericardium
hyracotherium
hesperidium
hieracium
hydroxonium
hematopericardium
hormogonium
hydropneumopericardium
Starts with I
8 words imperium
insectarium
intermedium
infusorium
interministerium
ichthyopterygium
inclinatorium
inhalatorium
Starts with L
5 words leprosarium
lectisternium
latrocinium
lubritorium
laserpicium
Starts with M
21 words moratorium
myocardium
myometrium
magisterium
manubrium
mycobacterium
marsupium
megatherium
ministerium
microsporangium
megasporangium
mesogastrium
macrosporangium
marrubium
mortarium
miracidium
martyrium
maggotorium
motorium
muscatorium
macrozoogonidium
Starts with N
12 words nasturtium
natatorium
neuroepithelium
nerium
nanobacterium
nephridium
nitronium
nitrobacterium
nidularium
nitrenium
nitrosobacterium
nototherium
Starts with O
9 words oceanarium
osmiridium
ostensorium
orarium
ossarium
osmeterium
orontium
ordalium
ophidiarium
Starts with P
24 words premium
planetarium
proscenium
presidium
pericardium
paramecium
primordium
praetorium
positronium
pelargonium
propionibacterium
pterygium
prothalamium
puerperium
precordium
principium
procambium
praeludium
perichondrium
pericranium
perimysium
pomerium
prostomium
parapodium
Starts with Q
3 words quadrennium
quadrivium
quadriennium
Starts with R
11 words rhizobium
refugium
radiostrontium
rosarium
reptilium
resilium
rhynchosporium
rhipidium
respiratorium
ranarium
restibrachium
Starts with S
24 words sanatorium
solarium
sanitarium
sporangium
superpremium
scriptorium
sensorium
stramonium
seaquarium
spermatogonium
sudarium
sacrarium
sclerotium
scolopendrium
sisymbrium
syllabarium
sestertium
sacerdotium
sudatorium
soredium
spermarium
synclinorium
spermogonium
sporogonium
Starts with T
23 words terrarium
trapezium
trillium
trivium
tentorium
triennium
transuranium
tepidarium
triclinium
triforium
trifolium
tetrazolium
tertium
teucrium
termitarium
trachelium
taurobolium
tetramethylammonium
tirocinium
tripudium
tridominium
tetrasporangium
trichosporangium
Starts with U
5 words uredium
unguentarium
uropygium
uintatherium
uredinium
Starts with V
6 words vivarium
vomitorium
verticillium
velarium
vivisectorium
vibracularium
Starts with Z
5 words zoosporangium
zygosporangium
zoarium
zoospermium
zoodendrium