member has 5 distinct synonyms spread across 3 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. Its one recorded opposite is nonmember.
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.
one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)
“only members will be admitted”
Synonyms, antonyms and the broader and narrower relations for member come from Princeton University’s WordNet. Full sources and licences.
anything that belongs to a set or class
“snakes are members of the class Reptilia”
an organization that is a member of another organization (especially a state that belongs to a group of nations)
“the library was a member of the interlibrary loan association”
the male sex organ (`member' is a euphemism)