apron has 2 distinct synonyms spread across 1 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
a garment of cloth or leather or plastic that is tied about the waist and worn to protect your clothing
(golf) the part of the fairway leading onto the green
the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain)
a paved surface where aircraft stand while not being used
Synonyms, antonyms and the broader and narrower relations for apron come from Princeton University’s WordNet. Full sources and licences.