fellow vs comrade

fellow and comrade both are nouns.

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

As nouns, fellow and comrade are synonyms defined as:

fellow and comrade: a friend who is frequently in the company of another

Other synonyms of fellow include associate, companion, familiar.

fellow (noun)	comrade (noun)
a boy or man	a friend who is frequently in the company of another
a man who is the lover of a man or woman	used as a term of address for those male persons engaged in the same movement
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