In a Ted Talk, Gever Tulley, used a very interesting terms when teaching to children : "Knowledgeability".
The definition of this term is simple : Knowing that we can know.
That correspond exactly to how I define a teacher in the knowledge diagram.
The teacher makes someone knowing that he does not know, and the trainer makes someone knowing what he knows he does not know. We can't forget the teacher said, because it is rooted in our subconscious, but we can forget what the trainer said if we don't practice enough.
Knowledgeability is a really good terms, I don't think the speaker said it on purpose though.