Brides can use Lances and Bows. This makes them the only class capable of using both the Blessed Lance and the Blessed Bow, the only weapons in the game that do "effective" damage against Revenant-type units. Thus, I have reason to believe that the Bride class is actually a secret society of zombie slayers.
Or maybe it's because Revenants are made of some kind of goo, and they're trying to imply that women are good at cleaning. One or the other.
Official Bride and Wife of Noire (of the Fire Emblem Awakening message board)