say it: BEN-uh-fak-tur
benefactor is a noun meaning "a person who helps people or institutions (especially with financial help)". It carries one recorded sense.
a person who helps people or institutions (especially with financial help)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for benefactor come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.