WordNet records no synonym and no antonym for skate. 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.
sports equipment that is worn on the feet to enable the wearer to glide along and to be propelled by the alternate actions of the legs
large edible rays having a long snout and thick tail with pectoral fins continuous with the head; swim by undulating the edges of the pectoral fins
move along on skates
“The Dutch often skate along the canals in winter”
Synonyms, antonyms and the broader and narrower relations for skate come from Princeton University’s WordNet. Full sources and licences.