original sin vs sinning

original sin and sinning both are nouns.

Word	Noun	Adjective	Verb	Adverb
original sin	Yes	No	No	No
sinning	Yes	Yes	No	No

As nouns, sinning is a hypernym of original sin; that is, sinning is a word with a broader meaning than original sin:

original sin: a sin said to be inherited by all descendants of Adam
sinning: an act that is regarded by theologians as a transgression of God's will

Other hypernyms of original sin include sin, church doctrine, creed, gospel, religious doctrine.

original sin (noun)	sinning (noun)
a sin said to be inherited by all descendants of Adam	an act that is regarded by theologians as a transgression of God's will

original sin (adjective)	sinning (adjective)
	transgressing a moral or divine law