11 letter words ending with um in the mammoth censored word list.

abecedarium acroclinium animalculum antependium antheridium antirrhinum apodyterium archegonium aspergillum aspersorium azothionium bottomonium bryophyllum californium candelabrum capillitium carborundum carpogonium cassiopeium cefmepidium cephalonium clinandrium clostridium columbarium condominium copernicium corrigendum crematorium cynoglossum cypripedium definiendum desideratum diascordium dinotherium dockominium einsteinium endocardium endocranium endometrium endoneurium endosporium endothecium endothelium epigastrium equilibrium erythronium eubacterium excrementum exoperidium extispicium eyespeculum ferrocerium florilegium formicarium frigidarium gametangium gynostemium haematobium helichrysum hesperidium hippeastrum hormogonium hydrargyrum hydroxonium imidazolium incunabulum inductorium insectarium intermedium interregnum intervallum intrapartum ipratropium latifundium latrocinium leprosarium livermorium lubritorium macrophylum maggotorium magisterium mediastinum mendelevium menispermum mesosporium mesosternum mesothelium mesothorium metasternum ministerium monochasium muscatorium nonaluminum nototherium oophoridium ophidiarium organistrum ostensorium pandemonium panjandarum paramaecium paramoecium parascenium pelargonium penicillium pericardium pericranium peridesmium perimetrium perineurium perisporium peristomium peristylium perithecium peritonaeum phosphonium pittosporum planetarium podophyllum polychasium polygonatum polyzoarium positronium postscenium procerebrum proctodaeum promycelium prothallium quadrennium retinaculum roentgenium satellitium schistidium scriptorium sempervivum sempiternum sericterium sphaeridium sporogonium staminodium stylopodium subcutaneum subdelirium succedaneum superphylum suppedaneum syllabarium syncerebrum taurobolium termitarium tetrazolium tridominium ultravacuum unnilhexium ununpentium ununseptium xenodochium xeranthemum zanthoxylum zoodendrium zoogonidium zoospermium