Napper rhymes with:
knapper, snapper, capper, clapper, dapper, flapper, kapper, kapur, klapper, knapper, rapper, sapper, snapper, tapper, trapper, wrapper
Napper sounds like:
naber, napier, napora, nappier, navar, navarra, navarre, navarro, neeper, neibauer, neubauer, neuber, never, newbauer, newberry, newbery, newbury, niebauer, niebuhr, niebur, nienaber, nipper, niver, noboru, nonmember, npr, nuber, nufer, nuffer, nuhfer, number