territory has 4 distinct synonyms spread across 2 of its 3 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 region marked off for administrative or other purposes
Synonyms, antonyms and the broader and narrower relations for territory come from Princeton University’s WordNet. Full sources and licences.
an area of knowledge or interest
“his questions covered a lot of territory”
the geographical area under the jurisdiction of a sovereign state
“American troops were stationed on Japanese soil”