8-Letter Words Ending in UM

There are 154 8-letter words that end in UM. 49 are common words, such as ACTINIUM and ADDENDUM. A rarer one is ZOOECIUM. In this set, I is the most frequent open letter (105 words). 18 words contain a doubled letter.

Full list 154

Common words

actiniumaddendumageratumalluviumaluminumaquariumbienniumcapsicumcementumcerebrumchromiumcoliseum
actiniumaddendumageratumalluviumaluminumaquariumbienniumcapsicumcementumcerebrumchromiumcoliseumcorundumdeliriumduodenumemporiumencomiumeuropiumfactotumfranciumgeraniumlaburnumlaudanumlinoleumlutetiummomentumnobeliumpendulumperineumplatinumplectrumpoloniumpudendumresiduumrubidiumsamariumscandiumseleniumsolariumspectrumsphagnumtantalumthalliumtitaniumtrilliumtympanumvanadiumviburnumvivariumabomasumaciculumalburnumallodiumammoniumargentumascidiumbasidiumbdelliumbrachiumcaladiumchecksumciboriumcingulumcoagulumconidiumcymatiumdelubrumdidymiumdiluviumdominiumelectrumeulogiumexemplumexordiumfrenulumfurculumgalbanumglucinumgonidiumguaiacumgyneciumhymeniumhypogeumilliniumimperiumindusiuminoculumlabdanumlabellumlixiviummasuriummezereummyceliumngultrumnympheumolibanumoogoniumpatagiumpeculiumperidiumpupariumpygidiumpyxidiumramentumrosariumsacellumscholiumsiliciumsolatiumsorediumspeculumspiculumsudariumsyconiumteetotumvariorumvasculumvelariumvexillumviaticumvinculumaconitumaecidiumaerobiumapteriumatheneumblackgumbothriumcardamumcoremiumdiestrumextremumguaiocumilluviumindiciumlomentumluteciummeconiumoncidiumoriganumpeponiumphiltrumplastrumpronotumpsylliumrefugiumsecundumsediliumspleniumtimpanumtomentumtriticumveratrumzooecium

About this list

Words
154 (49 common words)
Common example
actinium
Rare example
zooecium
Doubled letters
18
Ending in S
0
Most frequent letter
I (105)

Questions

How many 8-letter words ending in um are there?

154. 49 of them are common words.

What is a common example?

ACTINIUM is among the common words in this set.