One syllable words that rhyme with mass.
ass, bass, basse, blass, bras, brass, cas, cass, chasse, class, crass, das, dass, fahs, fass, gas, gass, glas, glass, gras, grass, grasse, hass, jass, kass, klas, klass, kras, krass, lass, last, mass, mass., masse, nass, pass, pasts, plas, plass, plasse, ras, sas, sass, sasse, tass, vass, yass