Mammoth Uncensored Word List:
107 words ending with is, 14 letters long

acrodermatitis amphiarthrosis antimetathesis antiperistasis arthrocentesis arthrogryposis bacteriostasis bronchiectasis caenorhabditis capsulorrhexis carcinogenesis carcinomatosis cardiocentesis chemosynthesis cholelithiasis chondrogenesis chondromatosis conjunctivitis craniostenosis cryptococcosis cyclosporiasis cystolithiasis dermatomycosis diverticulitis diverticulosis dracunculiasis echinococcosis electrogenesis electroosmosis elliptocytosis endoprosthesis enterocentesis epiphysiodesis erythropoiesis galactopoiesis gangliosidosis glycogenolysis granulomatosis haematogenesis haematopoiesis haemocytolysis heterokaryosis histoplasmosis hormonopoiesis hydrogenolysis hydronephrosis hypercatalexis hyperkeratosis hypertrichosis immunophoresis keratomileusis kyphoscoliosis leucocytolysis leukemogenesis maccheroncinis manrikigusaris melorheostosis metempsychosis mucoviscidosis narcocatharsis narcosynthesis nematodiriasis omphaloskepsis onchocerciasis onomatopoiesis osteoarthritis osteoarthrosis osteosynthesis paedomorphosis papillomatosis perichondritis phlebometritis phlebostenosis phlebostrepsis phosphorolysis photocatalysis photokeratitis photosynthesis plasmapheresis pleurapophysis pleurocentesis pneumoconiosis pneumokoniosis pododermatitis psephoanalysis pseudarthrosis psychoanalysis psychoneurosis pyelonephritis rhabdomyolysis rhinosinusitis spermiogenesis spirochaetosis sporotrichosis telangiectasis tendovaginitis thyrotoxicosis tornadogenesis treponematosis trichinellosis trichomoniasis trichophytosis trophoneurosis tsutsugamushis vitellogenesis vulvovaginitis xiphihumeralis