masculine has no recorded synonym. 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 2 recorded opposites are feminine, neuter.
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.
associated with men and not with women
a gender that refers chiefly (but not exclusively) to males or to objects classified as male
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for masculine.
Synonyms, antonyms and the broader and narrower relations for masculine come from Princeton University’s WordNet. Full sources and licences.