deadly sin vs invidia

deadly sin and invidia both are nouns.

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

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

deadly sin: an unpardonable sin entailing a total loss of grace
invidia: spite and resentment at seeing the success of another (personified as one of the deadly sins)

deadly sin (noun)	invidia (noun)
an unpardonable sin entailing a total loss of grace	spite and resentment at seeing the success of another (personified as one of the deadly sins)