Oatis rhymes with:
fotis, kariotis, notis, otis, veliotis, altice, anstice, anstiss, artis, arvanitis, aseritis, atlantis, atlantis', battis, bettis, botrytis, burtis, clematis, courtis, curtice, curtis', curtiss, custis, debenedictis, delaurentis, derobertis, desanctis, desantis, devincentis, disantis, duplantis, estis, eustice, fortis, fotis, fratus, gattis, gettis, gottis, hartis, huestis, injustice, intis, justis, kariotis, kasputys, kurtis, lamastus, lantis, lettice, loftis, logothetis, maldutis, maniatis, mantis, martis, matis, mattice, mattis, matus, mazaitis, mertice, metis, moraitis, mortis, myrtice, myrtis, notis, ortis, otis, pattis, peratis, peratis', petraitis, pettis, phlebitis, pneumocystis, politis, portis, prentice, prentiss, sholtis, shultis, solstice, soltis, veliotis, whitis, yantis
Oatis sounds like:
oates, oaths, oats, odaiko, oddities, odds, odes, odessa, odetics, odious, odysseus, odyssey, odyssey's, otis, otsego, otsuka, ottawa's, ottaway's, otto's, otts, out's, outage, outages, outdoes, outgo, outguess, outguesses, outhouse, outhouses, outs, outsize, outtake, outtakes, outweigh, outweighs, outwits, owades