religion vs Russian Orthodox

religion is a noun but Russian Orthodox is not a noun.

Word	Noun	Adjective	Verb	Adverb
religion	Yes	No	No	No
Russian Orthodox	No	Yes	No	No

religion (noun)	Russian Orthodox (noun)
a strong belief in a supernatural power or powers that control human destiny
an institution to express belief in a divine power

religion (adjective)	Russian Orthodox (adjective)
	of or relating to or characteristic of the Eastern Orthodox Church