Regattas rhymes with:
incata's, matas, sonatas, sowata's, suata's, advanta's, akita's, anastas, atlanta's, augusta's, betas, cheetahs, chipetas, costas, dakota's, dakotas, data's, datas, defreitas, delta's, deltas, djakarta's, fajitas, fermenta's, freitas, gaviotas, greta's, incata's, jakarta's, kostas, kotas, lakotas, lakotas', maestas, marietta's, matas, matsushita's, mehta's, mestas, minnesota's, nafta's, operettas, panetta's, pastas, pesetas, peta's, pinetta's, placetas, preyistas, quotas, rentas, rita's, sabatista's, sabatistas, sabatistas', sandinistas, sandinistas', sense-datas, shasta's, sonatas, sowata's, stratas, suata's, sumita's, takeshita's, toyota's, toyotas, travolta's, travoltas, vendettas, vista's, vistas, zapatista's, zapatistas
Regattas sounds like:
racists, rackets, racquets, ragtag, rastus, reacts, recedes, recites, rejects, requests, requisites, resets, resides, residues, resists, restage, restates, restock, rests, richts, rickets, ricketts, right's, righteous, rightish, rights, rights', rigidities, riksdag, roasts, rocket's, rockets, rockettes, roget's, rosettes, rosewood's, rostuca, rushdie's, russets, rust's, rustic, rusts, rusty's, rustys