neighborhood has 5 distinct synonyms spread across 3 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.
a surrounding or nearby region
“the plane crashed in the vicinity of Asheville”
the approximate amount of something (usually used prepositionally as in `in the region of')
“it was going to take in the region of two or three months to finish the job”
an area within a city or town that has some distinctive features (especially one forming a community)
“an ethnic neighborhood”
Synonyms, antonyms and the broader and narrower relations for neighborhood come from Princeton University’s WordNet. Full sources and licences.