tongue has 6 distinct synonyms spread across 5 of its 10 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity
a human written or spoken language used by a community; opposed to e.g. a computer language
any long thin projection that is transient
“tongues of flame licked at the walls”
a manner of speaking
“he spoke with a thick tongue”
the tongue of certain animals used as meat
the flap of material under the laces of a shoe or boot
articulate by tonguing, as when playing wind instruments
Synonyms, antonyms and the broader and narrower relations for tongue come from Princeton University’s WordNet. Full sources and licences.