Expletives rhymes with:
relative's, relatives, superlatives, additives, alternatives, conservatives, conservatives', cooperatives, derivatives, executive's, executives, executives', fixatives, imperatives, initiatives, laxatives, narratives, negatives, neoconservatives, operatives, palliatives, performatives, positives, prerogatives, preservatives, preventatives, relative's, relatives, representative's, representatives, representatives', superlatives