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42 words ending with sm, 15 letters long

anthropopathism anticlericalism anticolonialism antimaterialism antirationalism antiromanticism assimilationism confessionalism conventionalism cosmopolitanism ecclesiasticism enantiomorphism equalitarianism experimentalism futilitarianism governmentalism hermaphroditism humanitarianism hypercatabolism hyperinsulinism hypermetabolism hyperparasitism hyperthyroidism hypopituitarism instrumentalism intellectualism interventionism majoritarianism multilateralism multilingualism neoconservatism photojournalism professionalism semicolonialism stereoisomerism supernaturalism superparasitism superpatriotism thermoperiodism thromboembolism totalitarianism ultraliberalism