Board Thread:Wiki-Related Discussion/@comment-6302057-20151209070336/@comment-6302057-20151209073851

The term "realm" is also used frequently to describe different lands in 1x19 by Blue and Rumple, with Rumple also using the term "Realm Jumper" to describe a method of transportation to follow Baelfire to LWM in 1x19. If the term "Realm Jumper" meant someone who travels between regions of a land, then technically anyone could be one, contrary to the greater world-crossing role implied to follow Bae to another land.

Also, after the First Curse is undone by Regina, she explains in 3x19 that undoing the Curse "divided out realms...[and] placed a wall between them" and that they were unable to use portals any more. Portals are used to transport between lands (realms); the individual lands, not the regions within them, were divided by undoing the Curse.