speaking has 4 distinct synonyms spread across 2 of its 3 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 nonspeaking.
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 utterance of intelligible speech
delivering an address to a public audience
“people came to see the candidates and hear the speechmaking”
Synonyms, antonyms and the broader and narrower relations for speaking come from Princeton University’s WordNet. Full sources and licences.
capable of or involving speech or speaking
“human beings--the speaking animals”