Claassen rhymes with:
closson, klaassen, closson, glosson, klaassen, aasen, bossen, chiasson, closson, crossan, crosson, fossen, glosson, johson, josten, klaassen, maassen, osten, rosson, rosten, vanfossan, vanfossen, wason
Claassen sounds like:
calcagni, calcagno, calcium, calgene, calgon, calkin, callaghan, calligan, callison, chalasani, chilson, clasen, clason, classen, classicism, classman, classmen, classon, clausen, clauson, claussen, clawson, claxon, clayson, closson, coalson, colchicine, coleson, colgan, colgin, coliseum, collagen, collegian, colligan, collignon, collision, collison, colloquium, collusion, cologne, colosimo, colosseum, colson, coulson, culkin, culligan, cullison, cyclohexane