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