religious vs superior

religious and superior both are nouns.

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

As nouns, superior is a hyponym of religious; that is, superior is a word with a more specific, narrower meaning than religious:

religious: a member of a religious order who is bound by vows of poverty and chastity and obedience
superior: the head of a religious community

Other hyponyms of religious include friar, mendicant, monastic, monk, Benedictine, Jesuit, nun, eremite, cenobite, coenobite, votary.

religious (noun)	superior (noun)
a member of a religious order who is bound by vows of poverty and chastity and obedience	a character or symbol set or printed or written above and immediately to one side of another character
	one of greater rank or station or quality
	the head of a religious community
	a combatant who is able to defeat rivals

religious (adjective)	superior (adjective)
having or showing belief in and reverence for a deity	written or printed above and to one side of another character
of or relating to clergy bound by monastic vows	of or characteristic of high rank or importance
concerned with sacred matters or religion or the church	of high or superior quality or performance
extremely scrupulous and conscientious	having an orbit farther from the sun than the Earth's orbit
	(sometimes followed by `to') not subject to or influenced by
	having a higher rank
	(often followed by `to') above being affected or influenced by