man has 20 distinct synonyms spread across 7 of its 13 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 woman.
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.
someone who serves in the armed forces; a member of a military force
“two men stood sentry duty”
the generic use of the word to refer to any human being
“it was every man for himself”
any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage
a male subordinate
“the chief stationed two men outside the building”
an adult male person who has a manly character (virile and courageous competent)
“the army will make a man of you”
a manservant who acts as a personal attendant to his employer
“Jeeves was Bertie Wooster's man”
all of the living human inhabitants of the earth
“all the world loves a lover”
take charge of a certain job; occupy a certain work place
“Mr. Smith manned the reception desk in the morning”
Synonyms, antonyms and the broader and narrower relations for man come from Princeton University’s WordNet. Full sources and licences.