WordNet records no synonym and no antonym for maple. 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.
wood of any of various maple trees; especially the hard close-grained wood of the sugar maple; used especially for furniture and flooring
any of numerous trees or shrubs of the genus Acer bearing winged seeds in pairs; north temperate zone
Synonyms, antonyms and the broader and narrower relations for maple come from Princeton University’s WordNet. Full sources and licences.