spiritual rebirth vs salvation

spiritual rebirth and salvation both are nouns.

Word	Noun	Adjective	Verb	Adverb
spiritual rebirth	Yes	No	No	No
salvation	Yes	No	No	No

As nouns, salvation is a hypernym of spiritual rebirth; that is, salvation is a word with a broader meaning than spiritual rebirth:

spiritual rebirth: a spiritual enlightenment causing a person to lead a new life
salvation: (theology) the act of delivering from sin or saving from evil

Other hypernyms of spiritual rebirth include redemption.

spiritual rebirth (noun)	salvation (noun)
a spiritual enlightenment causing a person to lead a new life	(theology) the act of delivering from sin or saving from evil
	a means of preserving from harm or unpleasantness
	saving someone or something from harm or from an unpleasant situation
	the state of being saved or preserved from harm