Grave sin and Mortal sin

Mortal sin and grave sin are semantically related. in deadly sin topic. In some cases you can use "Mortal sin" instead a noun phrase "Grave sin".

Mortal sin noun - An unpardonable sin entailing a total loss of grace.

Grave sin and mortal sin are semantically related. You can use "Grave sin" instead a noun phrase "Mortal sin".