venial sin vs sinning

venial sin and sinning both are nouns.

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

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

venial sin: a pardonable sin regarded as entailing only a partial loss of grace
sinning: an act that is regarded by theologians as a transgression of God's will

Other hypernyms of venial sin include sin.

venial sin (noun)	sinning (noun)
a pardonable sin regarded as entailing only a partial loss of grace	an act that is regarded by theologians as a transgression of God's will

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