Here's what rhymes with benefical.
Words that almost rhyme with benefical
eligible educable penetrable pensionable equitable estimable heritable revocable predicable inevitable intelligible negligible creditable impenetrable irrevocable reputable pestilential questionable objectionable impressionable inequitable inheritable unmentionable demonstrable unintelligible disreputable discreditable exceptionable unquestionable unobjectionable unexceptionable