religious vs religiousness

religious and religiousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
religious	Yes	Yes	No	No
religiousness	Yes	No	No	No

religious (noun)	religiousness (noun)
a member of a religious order who is bound by vows of poverty and chastity and obedience	piety by virtue of being devout
	the quality of being extremely conscientious

religious (adjective)	religiousness (adjective)
having or showing belief in and reverence for a deity
of or relating to clergy bound by monastic vows
concerned with sacred matters or religion or the church
extremely scrupulous and conscientious