turf has 3 distinct synonyms spread across 1 of its 4 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.
surface layer of ground containing a mat of grass and grass roots
the territory claimed by a juvenile gang as its own
Synonyms, antonyms and the broader and narrower relations for turf come from Princeton University’s WordNet. Full sources and licences.
range of jurisdiction or influence
“a bureaucracy...chiefly concerned with turf...and protecting the retirement system”
cover (the ground) with a surface layer of grass or grass roots