Assertion rhymes with:
reassertion, insertion, reassertion, cistercian, coercion, desertion, exertion, gershon, insertion, mershon, reassertion
Assertion sounds like:
accordion, accreditation, accretion, ageratum, agerton, ascertain
reassertion, insertion, reassertion, cistercian, coercion, desertion, exertion, gershon, insertion, mershon, reassertion
accordion, accreditation, accretion, ageratum, agerton, ascertain