Japs rhymes with:
apps, cap's, capps, caps, chaps, claps, collapse, crapps, craps, elapse, flaps, gap's, gaps, kappes, kaps, knapp's, lapps, laps, lapse, maps, naps, perhaps, raps, relapse, saps, schnapps, scraps, slaps, snaps, straps, taps, traps, wraps, yaps, zaps
Japs sounds like:
jabs, jackovich, jacob's, jacoboski, jacobs, jacobs', jacobs's, jacobus, jafco, jafco's, jakubek, jakubiak, jakubik, jakubowicz, jakubowski, jeep's, jeeps, jeff's, jeffs, jeffus, jehovah's, jewfish, jewfishes, jibes, job's, jobes, jobs, jobs', jobs's, jokebook, jokebooks, joseph's, josephs, josephus, jukebox, jukeboxes