Countable Nouns Ending in UM and Containing R
This list gathers 701 English countable nouns ending in UM and containing R, such as Forum, Premium, Drum, Spectrum, Curriculum, Referendum and Rum. 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
arboretum
arum
antiserum
anthurium
antrum
arcanum
armamentarium
antirrhinum
ageratum
androecium
antheridium
argumentum
archegonium
apodyterium
alburnum
archaebacterium
adstratum
anacardium
asarum
aspergillum
aerarium
Starts with B
19 words bacterium
bupleurum
brachium
barathrum
bryum
bucranium
bullarium
bronchium
brontotherium
bryophyllum
brosimum
botrychium
bothrium
bromatium
bungarum
brimborium
botrydium
brontozoum
bronteum
Starts with C
24 words curriculum
consortium
conundrum
crematorium
chrysanthemum
cerebellum
cranium
cerebrum
corundum
candelabrum
centrum
columbarium
clostridium
cryptosporidium
corium
corrigendum
criterium
cyanobacterium
conservatorium
ciborium
calvarium
cestrum
credendum
crumbum
Starts with D
24 words drum
delirium
decorum
disequilibrium
diverticulum
desideratum
dolphinarium
dorsum
demonstrandum
dendrobium
deinotherium
desiderium
diphyllobothrium
digitorium
dicranum
doronicum
dirdum
dinotherium
diatretum
dracocephalum
delubrum
disciplinarium
dertrum
drepanium
Starts with E
24 words equilibrium
emporium
eardrum
endometrium
erratum
extremum
endocardium
epicardium
exordium
epineurium
eryngium
epigastrium
eupatorium
erechtheum
epipremnum
emplastrum
endoneurium
enterobacterium
epidendrum
erythroxylum
eubacterium
excubitorium
ergastulum
elotherium
Starts with F
16 words forum
freemium
falciparum
frustum
frenulum
fusarium
frenum
frigidarium
fermentum
feretrum
formicarium
florilegium
fumatorium
farfugium
flabrum
flabellarium
Starts with G
9 words geranium
granum
gymnatorium
gubernaculum
graphium
grassum
gatherum
gastraeum
graptopetalum
Starts with H
24 words honorarium
harmonium
herbarium
hypericum
hordeolum
hypochondrium
hippeastrum
helichrysum
hydronium
hibernaculum
heliotropium
haustorium
hedysarum
hypogastrium
horologium
helminthosporium
hydropericardium
hyracotherium
hesperidium
hieracium
hydroxonium
hematopericardium
hymenosporum
humstrum
Starts with I
13 words interregnum
imperium
indecorum
insectarium
intermedium
involucrum
infusorium
interambulacrum
intervallum
interministerium
ichthyopterygium
inclinatorium
inhalatorium
Starts with J
1 words jorum
Starts with K
1 words kettledrum
Starts with L
15 words labrum
laburnum
lustrum
loropetalum
leprosarium
ligustrum
lythrum
labarum
leptospermum
lithospermum
leucospermum
lectisternium
latrocinium
lubritorium
laserpicium
Starts with M
24 words memorandum
moratorium
myocardium
myometrium
magisterium
meerschaum
manubrium
mycobacterium
marsupium
megatherium
menstruum
ministerium
microsporangium
megasporangium
mesogastrium
macrosporangium
marrubium
mesembryanthemum
mezereum
mortarium
miracidium
martyrium
malvastrum
maggotorium
Starts with N
15 words nasturtium
nostrum
natatorium
nonpetroleum
neuroepithelium
nerium
ngultrum
nanobacterium
nephridium
nitronium
nitrobacterium
nidularium
nitrenium
nitrosobacterium
nototherium
Starts with O
15 words organum
operculum
oceanarium
origanum
ornithogalum
osmiridium
ostensorium
orarium
osteospermum
organistrum
ossarium
osmeterium
orontium
ordalium
ophidiarium
Starts with P
24 words premium
practicum
planetarium
plectrum
perineum
proscenium
presidium
peritoneum
pericardium
paramecium
primordium
philtrum
pyrethrum
praetorium
positronium
pelargonium
panjandrum
periosteum
pittosporum
propionibacterium
pterygium
prothalamium
puerperium
precordium
Starts with Q
4 words quorum
quadrennium
quadrivium
quadriennium
Starts with R
24 words referendum
rum
rectum
rostrum
rheum
residuum
reticulum
rhizobium
relatum
retinaculum
rumdum
refugium
redgum
regnum
responsum
radiostrontium
receptaculum
replum
rosarium
reptilium
rostellum
reddendum
resilium
rhodanthemum
Starts with S
24 words spectrum
serum
stratum
scrum
strum
scrotum
sternum
sorghum
sanatorium
solarium
sanitarium
simulacrum
sacrum
striatum
substratum
subforum
sugarplum
sporangium
sargassum
superpremium
scriptorium
supremum
sensorium
sistrum
Starts with T
24 words tantrum
thrum
terrarium
trapezium
trillium
trivium
tentorium
triduum
triennium
transuranium
taraxacum
tropaeolum
triticum
tepidarium
triclinium
triforium
trifolium
tetrazolium
tergum
triquetrum
tertium
teucrium
tormentum
termitarium
Starts with U
8 words umbraculum
understratum
uredium
unguentarium
uropygium
ultravacuum
uintatherium
uredinium
Starts with V
14 words viburnum
vivarium
vomitorium
verticillium
velarium
veratrum
variorum
verbascum
veronicastrum
verumontanum
vibraculum
vampyrum
vivisectorium
vibracularium
Starts with X
5 words xiphisternum
xiphosternum
xeranthemum
xerophyllum
xeromyrum
Starts with Z
6 words zoosporangium
zygosporangium
zoarium
zoospermium
zygantrum
zoodendrium