Unrest rhymes with:
abreast, addressed, breast, brest, chrest, compressed, crest, depressed, digressed, distressed, dressed, expressed, impressed, oppressed, pressed, prest, progressed, repressed, rest, stressed, suppressed, transgressed, trest, unaddressed, undressed, unimpressed, wrest
Unrest sounds like:
unhorsed, unmarked, unrehearsed, unrequited