active voice has 1 distinct synonym spread across 1 of its 1 sense. 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 passive voice.
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.
the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb
“`The boy threw the ball' uses the active voice”
Synonyms, antonyms and the broader and narrower relations for active voice come from Princeton University’s WordNet. Full sources and licences.