pullback has 1 distinct synonym spread across 1 of its 2 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 device (as a decorative loop of cord or fabric) for holding or drawing something back
“the draperies were drawn to the sides by pullbacks”
(military) the act of pulling back (especially an orderly withdrawal of troops)
“the pullback is expected to be over 25,000 troops”
Synonyms, antonyms and the broader and narrower relations for pullback come from Princeton University’s WordNet. Full sources and licences.