chest has 6 distinct synonyms spread across 3 of its 4 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.
the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates
box with a lid; used for storage; usually large and sturdy
the front of the trunk from the neck to the abdomen
“he beat his breast in anger”
furniture with drawers for keeping clothes
Synonyms, antonyms and the broader and narrower relations for chest come from Princeton University’s WordNet. Full sources and licences.