swag has 14 distinct synonyms spread across 3 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.
goods or money obtained illegally
a bundle containing the personal belongings of a swagman
walk as if unable to control one's movements
“The drunken man staggered into the room”
Synonyms, antonyms and the broader and narrower relations for swag come from Princeton University’s WordNet. Full sources and licences.