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26 words ending with sm, 16 letters long

anthropocentrism anthropomorphism antievolutionism antireductionism authoritarianism collaborationism communitarianism controversialism countercriticism counterterrorism electromagnetism environmentalism epiphenomenalism gynandromorphism hyperpituitarism institutionalism internationalism introspectionism multiculturalism necessitarianism premillennialism pseudoclassicism superromanticism supranationalism transnationalism ultranationalism