Captions rhymes with:
contraptions, adoptions, assumptions, conceptions, contraptions, corruptions, deceptions, descriptions, disruptions, egyptians, eruptions, exceptions, exemptions, inscriptions, interceptions, interruptions, misconceptions, misperceptions, option's, options, options', perceptions, preconceptions, prescriptions, presumptions, receptions, redemptions, subscriptions, transcriptions
Captions sounds like:
caftans, captain's, captaining, captains, captioning, chieftain's, chieftains, cohabiting