Concave rhymes with:
cave, aftershave, behave, brave, cave, crave, dave, deprave, engrave, enslave, fave, forgave, gave, grave, knave, kunaev, lafave, lave, lefave, mave, mcclave, misbehave, nave, pave, quave, rave, save, schave, shave, shortwave, slave, stave, they've, unfav, waive, wave
Concave sounds like:
chanishiva, comicopia, conasupo, conceive, consob