hack has 18 distinct synonyms spread across 10 of its 16 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 politician who belongs to a small clique that controls a political party for private rather than public ends
a tool (as a hoe or pick or mattock) used for breaking up the surface of the soil
a saddle horse used for transportation rather than sport etc.
Synonyms, antonyms and the broader and narrower relations for hack come from Princeton University’s WordNet. Full sources and licences.
cut away
“he hacked his way through the forest”