venial sin vs mortal sin

venial sin and mortal sin both are nouns.

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

venial sin (noun)	mortal sin (noun)
a pardonable sin regarded as entailing only a partial loss of grace	an unpardonable sin entailing a total loss of grace