Whether cursing is a graver sin than backbiting?

Objections

Objection 1 : It would seem that cursing is a graver sin than backbiting. Cursing would seem to be a kind of blasphemy, as implied in the canonical epistle of Jude (verse 9) where it is said that "when Michael the archangel, disputing with the devil, contended about the body of Moses, he durst not bring against him the judgment of blasphemy [Douay: 'railing speech']," where blasphemy stands for cursing, according to a gloss. Now blasphemy is a graver sin than backbiting. Therefore cursing is a graver sin than backbiting.
Objection 2 : Further, murder is more grievous than backbiting, as stated above (Question [73], Article [3]). But cursing is on a par with the sin of murder; for Chrysostom says (Hom. xix, super Matth.): "When thou sayest: 'Curse him down with his house, away with everything,' you are no better than a murderer." Therefore cursing is graver than backbiting.
Objection 3 : Further, to cause a thing is more than to signify it. But the curser causes evil by commanding it, whereas the backbiter merely signifies an evil already existing. Therefore the curser sins more grievously than the backbiter.