breath has 7 distinct synonyms spread across 2 of its 5 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 process of taking in and expelling air during breathing
“he took a deep breath and dived into the pool”
the air that is inhaled and exhaled in respiration
“his sour breath offended her”
Synonyms, antonyms and the broader and narrower relations for breath come from Princeton University’s WordNet. Full sources and licences.
a short respite
an indirect suggestion
“not a breath of scandal ever touched her”
a slight movement of the air
“there wasn't a breath of air in the room”