Orcas rhymes with:
dorcas, barcus, barkus, carcass, dorcas, farkas, marcus, markkas, markus, abacus, adamkus, aeronauticas, americus, amicus, antiochus, arlauskas, atticus, australopithecus, baccus, backus, barcus, barkus, baucus, bockus, bupkus, burkus, cacace, caracas, carcass, caucus, circus, coccus, copernicus, crocus, damascus, dicus, digalakis, discus, dorcas, dycus, enterococcus, farkas, fiscus, focus, fracas, gekas, georgakis, hocus, ickes', leviticus, linkous, locus, lucas, lucas', lucus, marcinkus, marcus, markkas, markus, medicus, mickus, mikus, mucous, mucus, pickus, pikus, pincus, pinkus, pocus, raucous, refocus, rimkus, roccas, ruckus, savikas, secaucus, shimkus, spartacus, stankus, staphylococcus, streptococcus, valukas, viscous, waitkus, yarmulkes, zekauskas
Orcas sounds like:
o'hara's, o'roark, o'rourke, oars, ohara's, orca, ores, org, orgies, orgy, orick, orix, orks, orky, oroark, oros, orosco, orosz, orourke, orozco, orrick, orrico, orris, orsa, orsak, orsay, orsi, orso, orwick, orwig, oryx, orzech, orzechowski, ours, ourso