mortal sin vs ire

mortal sin and ire both are nouns.

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

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

mortal sin: an unpardonable sin entailing a total loss of grace
ire: belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)

mortal sin (noun)	ire (noun)
an unpardonable sin entailing a total loss of grace	belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)
	a strong emotion; a feeling that is oriented toward some real or supposed grievance