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