Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
bĕnĕfăcĭo, fēci, factum, 3, v. n., better written as two words, v. bene, I. B. 2.
bĕnĕfactor, ōris, m. [benefacio], he who confers a favor, a benefaclor (late Lat.), Coripp. Laud. Anast. Quaest. 19; id. Laud. Just. 1, 314.