religious mysticism vs religion

religious mysticism and religion both are nouns.

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

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

religious mysticism: a religion based on mystical communion with an ultimate reality
religion: a strong belief in a supernatural power or powers that control human destiny

Other hypernyms of religious mysticism include faith, religious belief.

religious mysticism (noun)	religion (noun)
a religion based on mystical communion with an ultimate reality	a strong belief in a supernatural power or powers that control human destiny
	an institution to express belief in a divine power