Brightly rhymes with:
forthrightly, rightly, sprightly, forthrightly, knightly, lightly, nightly, politely, rightly, slightly, sprightly, stitely, tightly, unsightly, whiteley, whitely
Brightly sounds like:
barkdoll, barkdull, barksdale, bergdahl, bergdoll, birkedal, brechtel, brightwell, bristle, bristol