Yass rhymes with:
alas, amass, ass, bass, basse, blass, bras, brass, cas, cass, chasse, class, crass, das, dass, depass, fahs, fass, 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 sounds like:
y's, y.'s, yack, yacko, yacos, yagi, yahoos, yak, yake, yakusa, yasso, yasuhiko, yasuo, yasushi, yasuyoshi, yauch, yax, yazzie, yeakey, yeas, yeck, yeosock, yes, yeses, yeske, yessuey, yew's, yikes, yoak, yockey, yoes, yoga, yogi, yoichi, yoke, yokes, yokich, yoko, yokokohji, yoos, yoshi, yoshiaki, yoshihashi, yoshihisa, yoshikawa, yoshikazu, yoshio, yoshioka, yoss, yossi, yous, youse, yoyos, yu's, yucca, yuck, yucky, yugo, yugo's, yugos, yuhas, yuhasz, yuichi, yuk, yukio, yuko, yuks, yusko