Contraptions rhymes with:
captions, adoptions, assumptions, captions, conceptions, 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
Contraptions sounds like:
contributing, contributions, counterfeiting