Thalassa rhymes with:
kolasa, lassa, lhasa, alcasa, asa, basa, benincasa, bokassa, bourassa, cahasa, casa, casassa, dasa, diasa, enasa, hiromasa, kielbasa, kinshasa, kolasa, lanasa, lassa, lhasa, masa, matassa, mombasa, ossa, premadasa, rzasa
Thalassa sounds like:
tadlock, tailhook, tails, talaga, talc, talcs, tales, talese, talk, talk's, talkie, talkies, talks, talky, tallahassee, tallahassee's, tallies, tatlock, telco, telecheck, telesco, telesis, telesis', telesis's, telex, telex's, telexes, telles, tellez, tellis, tells, telos, telugu, thalia's, theology, thewlis, thielke, thielsch, tieless, tiles, tilles, tillis, tilly's, titles, toils, toles, tolles, tolls, tools, toothless, toothlike, total's, totals, toulouse, towels, towle's, towles, tullis, tullius, tulloch, tullock, tullos, tulsa, tutelage, tylka