comrade vs fellow

comrade and fellow both are nouns.

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

As nouns, comrade and fellow are synonyms defined as:

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

Other synonyms of comrade include associate, companion, familiar.

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