Funnest rhymes with:
abortionist, africanist, agonist, anticommunist, balloonist, brownest, collaborationist, colonist, constitutionist, constructionist, earnest, expansionist, extortionist, greenest, humanist, hygienist, internist, interventionist, leninist, misogynist, noncommunist, nutritionist, opportunist, percussionist, peronist, preservationist, protectionist, receptionist, rejectionist, religionist, reservationist, revisionist, revolutionist, satanist, saxophonist, secessionist, segregationist, stalinist, tannest, thinnest, trombonist, zionist
Funnest sounds like:
famished, fancied, fanciest, feminist, fenced, financed, finessed, finest, finished, finstad, fumigate, fungicide, funniest