dogfight has 4 distinct synonyms spread across 1 of its 6 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 fiercely disputed contest
“their rancor dated from a political dogfight between them”
an aerial engagement between fighter planes
a violent fight between dogs (sometimes organized illegally for entertainment and gambling)
engage in an aerial battle with another fighter plane
Synonyms, antonyms and the broader and narrower relations for dogfight come from Princeton University’s WordNet. Full sources and licences.