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
Synonyms, antonyms and the broader and narrower relations for brake come from Princeton University’s WordNet. Full sources and licences.
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”