beneficent has 3 distinct synonyms spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is maleficent.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
doing or producing good
“the most beneficent regime in history”
generous in assistance to the poor
“a benevolent contributor”
Synonyms, antonyms and the broader and narrower relations for beneficent come from Princeton University’s WordNet. Full sources and licences.