religious order vs religion

religious order and religion both are nouns.

Word	Noun	Adjective	Verb	Adverb
religious order	Yes	No	No	No
religion	Yes	No	No	No

As nouns, religion is a hypernym of religious order; that is, religion is a word with a broader meaning than religious order:

Other hypernyms of religious order include faith, organized religion.

religious order (noun)	religion (noun)
a subdivision of a larger religious group	a strong belief in a supernatural power or powers that control human destiny
	an institution to express belief in a divine power