Mammoth Uncensored Word List:
128 words ending with sm, 14 letters long

abstractionism allelomorphism andromonoecism anthropophuism antialcoholism anticapitalism antiliberalism antimilitarism antimonarchism antipatriotism antiquarianism antiradicalism apheliotropism apocalypticism associationism bidialectalism bioregionalism breatharianism centenarianism centripetalism constructivism continentalism cruciverbalism cryptorchidism cyberterrorism dichromaticism dissolutionism ectoparasitism egalitarianism encyclopaedism endoparasitism evangelicalism exceptionalism existentialism extensionalism ferrimagnetism ferromagnetism flexitarianism fundamentalism galvanotropism heterochronism heteromorphism heterothallism hobbledehoyism holometabolism homochromatism homoeomorphism hypercriticism hypoadrenalism hypochondriasm hypophalangism hypothyroidism incrementalism indifferentism inspirationism intentionalism interactionism intersexualism intuitionalism libertarianism lipogrammatism matriarchalism metachromatism microorchidism millenarianism monochromatism monolingualism multiracialism narcoterrorism necessarianism neocolonialism noncognitivism nonmaterialism nonobjectivism obstructionism operationalism overenthusiasm paleomagnetism parajournalism patriarchalism pentadactylism perfectibilism peripateticism phallocentrism photoperiodism piezomagnetism pococuranteism polychromatism polysynthesism polysynthetism predeterminism prescriptivism probabiliorism progressionism prohibitionism proletarianism pseudoaneurysm pseudomelanism pseudomorphism psilanthropism quattrocentism reactionaryism restitutionism restorationism restrictionism sacramentalism semiparasitism sensationalism sentimentalism servomechanism substantialism synaposematism telejournalism territorialism tetartohedrism theocentricism theriomorphism thermochromism traditionalism transsexualism transvestitism tripersonalism trituberculism ultramodernism ultramontanism unsectarianism utilitarianism xanthochromism