communist vs Comrade

communist and Comrade both are nouns.

Word	Noun	Adjective	Verb	Adverb
communist	Yes	Yes	No	No
Comrade	Yes	No	No	No

As nouns, Comrade is a hyponym of communist; that is, Comrade is a word with a more specific, narrower meaning than communist:

Other hyponyms of communist include apparatchik, Bolshevik, Bolshevist, revisionist.

communist (noun)	Comrade (noun)
a socialist who advocates communism	a fellow member of the Communist Party

communist (adjective)	Comrade (adjective)
relating to or marked by communism