Knapper rhymes with:
napper, snapper, capper, clapper, dapper, flapper, kapper, kapur, klapper, napper, rapper, sapper, snapper, tapper, trapper, wrapper
Knapper sounds like:
kamber, kamper, kampfer, kazempour, kemper, kempfer, kennebrew, kimber, kimbro, kinnebrew, knepper, knipfer, knipper