comrade vs brother

comrade and brother both are nouns.

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

As nouns, comrade and brother are synonyms defined as:

comrade and brother: used as a term of address for those male persons engaged in the same movement

comrade (noun)	brother (noun)
a friend who is frequently in the company of another	a male with the same parents as someone else
used as a term of address for those male persons engaged in the same movement	a male person who is a fellow member (of a fraternity or religion or other group)
	a close friend who accompanies his buddies in their activities
	used as a term of address for those male persons engaged in the same movement