Mammoth Uncensored Word List:
134 words ending with um, 7 letters long

agendum alumium alyssum amentum arcanum baculum ballium blellum bluegum bohrium cadmium caesium calcium cambium centrum chetrum chillum cranium crissum crumbum decorum dubnium eardrum elogium eluvium elytrum enrheum erodium erratum exuvium fermium fraenum frustum fulcrum gallium grassum hafnium hahnium hassium holmium hoodlum humdrum hummaum ideatum infimum iridium ischium jejunum jugulum labarum ladanum lithium lustrum mashlum maximum mesclum minimum modicum muonium natrium niobium nostrum notaeum oestrum offscum omentum opossum optimum orarium organum osculum outswum oxonium pabulum pallium panicum pantoum papadum pinetum plagium plumbum pomatum popadum premium protium punctum pythium quantum rastrum relatum rhenium rhodium rostrum sanctum scrotum seculum sistrum skellum skookum slumgum smeddum solanum solidum sorghum spodium stadium stannum sternum stewbum stibium stickum stomium stratum studium taedium tantrum tapetum templum terbium tertium tetotum thorium thulium trankum triduum trinkum tritium trivium uranium uredium vitreum yttrium zoarium zoecium