playmate vs comrade

playmate and comrade both are nouns.

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

As nouns, comrade is a hypernym of playmate; that is, comrade is a word with a broader meaning than playmate:

Other hypernyms of playmate include associate, companion, familiar, fellow.

playmate (noun)	comrade (noun)
a companion at play	a friend who is frequently in the company of another
	used as a term of address for those male persons engaged in the same movement