brake has 3 distinct synonyms spread across 1 of its 7 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 restraint used to slow or stop a vehicle
any of various ferns of the genus Pteris having pinnately compound leaves and including several popular houseplants
large coarse fern often several feet high; essentially weed ferns; cosmopolitan
an area thickly overgrown usually with one kind of plant
anything that slows or hinders a process
“she wan not ready to put the brakes on her life with a marriage”
stop travelling by applying a brake
“We had to brake suddenly when a chicken crossed the road”
Synonyms, antonyms and the broader and narrower relations for brake come from Princeton University’s WordNet. Full sources and licences.