WordNet records no synonym and no antonym for reseat. 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.
provide with a new seat
“reseat the old broken chair”
provide with new seats
“reseat Carnegie Hall”
show to a different seat
“The usher insisted on reseating us”
Synonyms, antonyms and the broader and narrower relations for reseat come from Princeton University’s WordNet. Full sources and licences.