Bilingual rhymes with:
monolingual, dingwall, monolingual, dingwall, monolingual, dingwall, monolingual, multilingual, actual, aggarwal, agrawal, casual, coequal, cromwell, dingwall, equal, heterosexual, homosexual, individual, monolingual, multilingual, mutual, perceptual, semiannual, sendawal, sensual, sequel, spiritual, textual, tidwell, tranquil, unequal, unusual, usual, visual
Bilingual sounds like:
billingslea, billingsley, billingsly, blankley, blankly, bullwinkle, bulwinkle