Napp rhymes with:
knapp, nap, schnapp, snap, snapp, app, cap, capp, chap, chapp, clap, clapp, crap, dapp, entrap, flap, frap, gap, gapp, giap, hap, happ, happe, jap, kapp, klapp, knapp, krapp, lap, lapp, lappe, map, mapp, nap, pap, papp, rap, rapp, rappe, sap, sapp, schapp, schnapp, scrap, shap, shapp, slap, snap, snapp, stapp, strap, tap, tapp, tappe, trap, trapp, trappe, unwrap, wrap, yap, yapp, zap, zapp
Napp sounds like:
naab, nab, nabb, nabi, nabob, naef, naeve, naff, naify, naive, nambi, namibia, namphy, nanobaby, nap, napa, napea, nappa, nappi, nappo, nav, nava, nave, navy, neave, neeb, neef, neff, nepa, nephew, neuhoff, neva, neve, neveau, neveu, newbie, newby, newwave, nib, nibbe, niehoff, nimby, nineveh, nip, nipp, nippy, nobbe, nobuo, nope, nouveau, nov, nova, novey, novi, novia, novo, novoa, novy, nub, nuevo, numb, nuova, nuovo, nymph