fellow

nouns

a boy or man
"that chap is your host"; "there's a fellow at the door"; "he's a likable cuss"; "he's a good bloke"
blighter, bloke, chap, cuss, fella, feller, fellow, gent, lad
a friend who is frequently in the company of another
"drinking companions"; "comrades in arms"
associate, companion, comrade, familiar, fellow
is derived from
fellowship
a person who is member of one's class or profession
"the surgeon consulted his colleagues"; "he sent e-mail to his fellow hackers"
colleague, confrere, fellow
is derived from
fellowship
one of a pair
"he lost the mate to his shoe"; "one eye was blue but its fellow was brown"
fellow, mate
a member of a learned society
"he was elected a fellow of the American Physiological Association"
fellow
is a type of (narrower)
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"; "a member of the faculty"; "she was introduced to all the members of his family"
fellow member, member
an informal form of address for a man
"Say, fellow, what are you doing?"; "Hey buster, what's up?"
buster, dude, fellow
a man who is the lover of a girl or young woman
"if I'd known he was her boyfriend I wouldn't have asked"
beau, boyfriend, fellow, swain, young man