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WordNet records no synonym and no antonym for hub. 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.
the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes
a center of activity or interest or commerce or transportation; a focal point around which events revolve
“the playground is the hub of parental supervision”
Synonyms, antonyms and the broader and narrower relations for hub come from Princeton University’s WordNet. Full sources and licences.