fellow vs pair

fellow and pair both are nouns.

Word	Noun	Adjective	Verb	Adverb
fellow	Yes	No	No	No
pair	Yes	No	Yes	No

fellow (noun)	pair (noun)
a boy or man	two people considered as a unit
a man who is the lover of a man or woman	a set of two similar things considered as a unit
a friend who is frequently in the company of another	a poker hand with 2 cards of the same value
a person who is member of one's class or profession	two items of the same kind
an informal form of address for a man
a member of a learned society
one of a pair

fellow (verb)	pair (verb)
	engage in sexual intercourse
	bring two objects, ideas, or people together
	arrange in pairs
	occur in pairs
	form a pair or pairs