companion vs comrade

companion and comrade both are nouns.

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

As nouns, companion and comrade are synonyms defined as:

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

Other synonyms of companion include associate, familiar, fellow.

companion (noun)	comrade (noun)
a friend who is frequently in the company of another	a friend who is frequently in the company of another
one paid to accompany or assist or live with another	used as a term of address for those male persons engaged in the same movement
a traveler who accompanies you

companion (verb)	comrade (verb)
be a companion to somebody