Truism rhymes with:
absenteeism, amateurism, anthropomorphism, antidisestablishmentarianism, atavism, baptism, buddhism, careerism, cubism, culturalism, defeatism, deism, dimorphism, dwarfism, ethnocentrism, extremism, idealism, irredentism, isomorphism, jainism, jingoism, marxism, masochism, mccarthyism, modalism, monism, monotheism, multiculturalism, multilateralism, nazism, nestorianism, parliamentarianism, pietism, polymorphism, polytheism, pugilism, realism, sadism, sexism, surrealism, taoism, theism, vandalism, vegetarianism, vigilantism, voyeurism
Truism sounds like:
tarquinio, tarzan, terracciano, terrorism, terzian, thoresen, thoreson, thorsen, thorson, threesome, tiresome, torgeson, torosian, torrejon, torsion, tourigny, tourism, trajan, treason, trism, trochmann, trojan, truchan, turchin, turchyn, turgeon, turismo, turkmen