Here's what rhymes with participant.
nonparticipant Words that almost rhyme with participant
visitant dissonant filament ligament vigilant virulent sycophant difficult legitimate ambivalent predicament silicate stimulant littlest medicament nimblest cheerfullest timpanist ficklest particulate simulate empiricist militarist belittlement ministrant nonvirulent equivalent magnificent abolitionist discriminant inarticulate grandiloquent dissimulate gesticulate imprisonment individuate prohibitionist coalitionist exhibitionist indiscriminate nonequivalent