Fass rhymes with:
fahs, alas, amass, ass, bass, basse, blass, bras, brass, cas, cass, chasse, class, crass, das, dass, depass, fahs, gas, gass, glas, glass, gras, grass, grasse, harass, hass, impasse, jass, kass, klas, klass, kras, krass, lass, mass, mass., masse, middle-class, morass, nass, pass, plas, plass, plasse, ras, repass, sas, sass, sasse, smartass, surpass, tass, umass, vanasse, vass, yass
Fass sounds like:
f's, f.'s, faas, fac, face, faces, facey, facie, fag, fagg, fags, fahs, fake, fakes, fasick, fasig, faso, faso's, faubus, faucheux, fauci, faus, fausey, fauss, faux, favazza, fawbush, fawkes, fax, faxes, fay's, faye's, fayez, faz, faze, fazekas, fazio, fazzio, fe's, feces, feck, feeback, feebis, fees, feese, feick, feig, feige, feis, fejes, fescue, fess, fez, fiacco, fiasco, fiascos, fica, ficco, ficek, fichus, fick, ficke, fickes, fico, fiebig, fiefs, fig, figg, figge, figgie, figgie's, figgs, figs, fiji, fiji's, fike, fikes, fipps, fis, fisc, fisch, fiscus, fish, fish's, fishes, fishy, fisk, fisk's, fiske, fiske's, fiss, five's, fiveash, fives, fix, fixes, fizz, fobbs, fobes, focaccia, focus, focuses, foes, fog, fogg, fogg's, foggy, fogs, fogy, foisy, fooks, foos, foose, fooshee, fosco, foshee, fosia, foskey, foss, fosse, fossey, fossey's, fouch, fouche, fouse, fousek, foushee, fowkes, fox, fox's, foxes, foxx, foxy, fs, fsi, fucci, fuchs, fuchsias, fuck, fucks, fugazy, fuge, fugue, fugues, fuhs, fuji, fuji's, fujii, fujikawa, fujio, fujioka, fujis, fujisawa, fujiya, fuke, fukowoka, fukui, fukuoka, fuoco, fuoss, fuqua, fuquay, fusco, fuse, fuses, fuss, fusses, fussy, fuzes, fuzz, fuzzy, fyffes, fyke, fyock