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122 words ending with um, 9 letters long

aluminium americium anthodium anthurium antiserum arboretum asphaltum athenaeum bacterium berkelium beryllium botulinum bronchium bubblegum calcaneum caldarium calvarium capitulum castoreum claustrum clitellum coccidium colchicum collegium colluvium collyrium colosseum colostrum columbium contagium continuum conundrum credendum criterium ctenidium cubiculum cymbidium decennium dentalium deuterium diazonium dichasium doronicum effluvium endosteum epicedium epimysium equisetum euphonium flabellum flagellum gelsemium germanium gymnasium gynaeceum gynaecium gynoecium harmonium herbarium hospitium hydronium indecorum lanthanum magnesium manubrium marsupium mausoleum mazaedium menstruum neodymium neptunium operculum opusculum palladium paramylum petroleum plutonium pollinium polygonum potassium practicum presidium pterygium pycnidium pyrethrum reptilium responsum reticulum rhizobium rostellum ruthenium sacrarium sargassum sarmentum scutellum sensillum sensorium septarium spirillum stomodeum strontium subphylum sugarplum sulfonium sympodium symposium syncytium tegmentum tellurium tenaculum terrarium trapezium triennium trifolium triforium ultimatum unguentum uredinium uropygium vestigium ytterbium zirconium