Quiescent rhymes with:
adolescent, antidepressant, bessent, convalescent, crescent, depressant, effervescent, evanescent, fluorescent, incandescent, incessant, iridescent, luminescent, obsolescent, suppressant
Quiescent sounds like:
quaint, quandt, quant, quantity, quasimodo, quickened, quicksand, quint, quinta, quintet, quinto