property has 6 distinct synonyms spread across 4 of its 5 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.
something owned; any tangible or intangible possession that is owned by someone
“that hat is my property”
a basic or essential attribute shared by all members of a class
“a study of the physical properties of atomic particles”
any movable articles or objects used on the set of a play or movie
“before every scene he ran down his checklist of props”
Synonyms, antonyms and the broader and narrower relations for property come from Princeton University’s WordNet. Full sources and licences.