Flaps rhymes with:
claps, collapse, elapse, lapps, laps, lapse, relapse, slaps, apps, cap's, capps, caps, chaps, claps, collapse, crapps, craps, elapse, gap's, gaps, japs, kappes, kaps, knapp's, lapps, laps, lapse, maps, naps, perhaps, raps, relapse, saps, schnapps, scraps, slaps, snaps, straps, taps, traps, wraps, yaps, zaps
Flaps sounds like:
fallback, felps, filipek, filipiak, filipkowski, filipovic, filipowicz, filipski, filofax, flapjack, flapjacks, flavius, flips, flops, flubs, fluffs, fullback, fullbacks