sinning vs deadly sin

sinning and deadly sin both are nouns.

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

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

sinning: an act that is regarded by theologians as a transgression of God's will
deadly sin: an unpardonable sin entailing a total loss of grace

Other hyponyms of sinning include fall, actual sin, original sin, mortal sin, venial sin.

sinning (noun)	deadly sin (noun)
an act that is regarded by theologians as a transgression of God's will	an unpardonable sin entailing a total loss of grace

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