deadly sin vs acedia

deadly sin and acedia both are nouns.

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

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

deadly sin: an unpardonable sin entailing a total loss of grace
acedia: apathy and inactivity in the practice of virtue (personified as one of the deadly sins)

deadly sin (noun)	acedia (noun)
an unpardonable sin entailing a total loss of grace	apathy and inactivity in the practice of virtue (personified as one of the deadly sins)