Adieu rhymes with:
ado, badu, pas-de-deux, yabbadabbadoo, ado, badu, chengdu, deux, dew, do, doo, douwe, du, due, katmandu, ledoux, long-overdue, outdo, overdo, overdue, pas-de-deux, perdue, purdue, redo, seydoux, subdue, undo, undue, urdu, yabbadabbadoo
Adieu sounds like:
ad, ada, adah, aday, add, added, addeo, addie, addy, ade, adee, adey, adia, adid, ado, ady, ahead, aid, aida, aide, aided, aidid, at, ata, ate, atha, athey, athie, atta, attaway, attie, attitude, attwood, atwood, aud, audet, audette, audi, audia, audio, audit, audited, auth, auto, autodie, autotote, awad, await, awaited, awed, aweida, aydt, ayodhya, ayotte, ayyad