WordNet records no synonym and no antonym for manchester. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
largest city in New Hampshire; located in southeastern New Hampshire on the Merrimack river
a city in northwestern England (30 miles to the east of Liverpool); heart of the most densely populated area of England
Synonyms, antonyms and the broader and narrower relations for manchester come from Princeton University’s WordNet. Full sources and licences.