deadly sin vs rapacity

deadly sin and rapacity both are nouns.

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

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

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

deadly sin (noun)	rapacity (noun)
an unpardonable sin entailing a total loss of grace	reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)
	extreme gluttony
	(of an animal, usually a bird) The quality of subsisting off live prey.