deadly sin vs superbia

deadly sin and superbia both are nouns.

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

As nouns, superbia is a hyponym of deadly sin; that is, superbia is a word with a more specific, narrower meaning than deadly sin:

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

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