deadly sin vs greed

deadly sin and greed both are nouns.

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

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

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

deadly sin (noun)	greed (noun)
an unpardonable sin entailing a total loss of grace	reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)
	excessive desire to acquire or possess more (especially more material wealth) than one needs or deserves