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