Here's what rhymes with heightening.
frightening tightening lightening brightening enlightening Words that almost rhyme with heightening
widening ripening siphoning cycling silencing likening titling livening licensing rioting dialing dieting idling piloting spiraling rivalling spiralling pirating rivaling sidling dialling sniveling recycling entitling quieting enlivening libeling playacting redialing redialling disquieting motorcycling