Extenuate rhymes with:
attenuate, attenuate, attenuate, attenuate, devaluate, evaluate, attenuate, devaluate, effectuate, evaluate, infatuate, punctuate, reevaluate, self-perpetuate, situate
Extenuate sounds like:
eastend, eastmet, eastwind, eighteenth, esteemed, estimate, estimated, excitement, existent, extant, extend, extended, extent