mortal sin vs avarice

mortal sin and avarice both are nouns.

Word	Noun	Adjective	Verb	Adverb
mortal sin	Yes	No	No	No
avarice	Yes	No	No	No

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

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

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