deadly sin vs avaritia

deadly sin and avaritia both are nouns.

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

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

deadly sin: an unpardonable sin entailing a total loss of grace
avaritia: reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)

deadly sin (noun)	avaritia (noun)
an unpardonable sin entailing a total loss of grace	reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)