Board Thread:Speculation House/@comment-10380701-20131018004029/@comment-10390252-20131021171114

The big difference is that Semblance is single aspect generally considered to be unique to an individual.

As I understand it, it is possible for a character in Naruto to learn any Jutsu given enough time and training. However, Semblance is closer to being a 'use', being an aspect of aura use that only a person with the right aura energy can learn. Basically, there are generic uses such as sensing and a single, possibly unique, specific use for each individual.

So, in this scheme, 'Spell' would actually be Dust as this is a multi-purpose application. The match still isn't precise but it is more accurate.