fellow vs male person

fellow and male person both are nouns.

Word	Noun	Adjective	Verb	Adverb
fellow	Yes	No	No	No
male person	Yes	No	No	No

As nouns, male person is a hypernym of fellow; that is, male person is a word with a broader meaning than fellow:

Other hypernyms of fellow include male.

fellow (noun)	male person (noun)
a boy or man	a person who belongs to the sex that cannot have babies
a man who is the lover of a man or woman
a friend who is frequently in the company of another
a person who is member of one's class or profession
an informal form of address for a man
a member of a learned society
one of a pair