Mammoth Uncensored Word List:
175 words ending with um, 10 letters long

acetabulum acroterium ambulacrum ammoniacum anacardium anaerobium androecium antebellum antepartum apothecium argumentum ascogonium atracurium auditorium bacteriium cafetorium capitellum cerebellum charmonium chromidium cinerarium cockalorum coenosteum colloquium compendium compluvium consortium corniculum curriculum cycleonium delphinium dendrobium desiderium digitorium dysprosium embothrium emplastrum epicardium epicentrum epicranium epidendrum epineurium episternum epithelium eponychium eriophorum eupatorium euphorbium exosporium filopodium fumatorium gadolinium glochidium gnaphalium haustellum haustorium hemelytrum honorarium horologium hypanthium individuum indumentum involucrum iridosmium kettledrum lawrencium lebensraum lenocinium lycopodium meerschaum meitnerium memorandum millennium miracidium molybdenum monopodium moratorium myocardium myometrium nasturtium natatorium nephridium nidamentum nonlithium nonminimum oceanarium ommatidium opprobrium osmeterium osmiridium panaritium pancratium panjandrum paramecium parapodium pentathlum peridinium perigonium perimysium periosteum peritoneum petrolatum photoalbum phyllodium plantarium plasmodium polemonium polyparium postbellum postpartum postulatum praeludium praesidium praetorium presternum primordium principium procambium proctodeum prometheum promethium propagulum propylaeum proscenium prosternum prostomium psalterium puerperium pyridinium quadrivium referendum sanatarium sanatorium sanitarium sanitorium sclerotium seaborgium seaquarium septennium sequestrum sestertium simillimum simulacrum sparganium spermarium spermatium spiraculum sporangium stichidium stomodaeum stramonium stumblebum suboptimum subsellium substratum sudatorium sulphonium surrogatum synandrium technetium tentaculum tepidarium thalictrum tirocinium triclinium triquetrum tropaeolum tuberculum tweedledum umbraculum ununoctium vestibulum vibraculum vomitorium zoothecium