superbia vs mortal sin

superbia and mortal sin both are nouns.

Word	Noun	Adjective	Verb	Adverb
superbia	Yes	No	No	No
mortal sin	Yes	No	No	No

As nouns, mortal sin is a hypernym of superbia; that is, mortal sin is a word with a broader meaning than superbia:

superbia: unreasonable and inordinate self-esteem (personified as one of the deadly sins)
mortal sin: an unpardonable sin entailing a total loss of grace

Other hypernyms of superbia include deadly sin.

superbia (noun)	mortal sin (noun)
unreasonable and inordinate self-esteem (personified as one of the deadly sins)	an unpardonable sin entailing a total loss of grace