In Dealing with players of vastly different skill levels?, I got into a discussion with @SevenSidedDie about characterizing Dungeon World as a story game. @SevenSidedDie stated that:
@neontapir Point of order, Dungeon World isn't a really a storygame. It's pretty traditional in most ways, except rolls being for randomising what rule governs what happens next instead of randominsing a binary pass/fail. DW would probably suit this player (these choices would be more likely to result in adventure, less stabby death). An actual storygame is different enough from D&D and DW, and each storygame is different from all the others, that there's no way to guess whether one would suit this player.
He further described Dungeon World after I prompted him for more information:
Me: I'm intrigued, @SevenSidedDie. I've always thought of it as one. The tag for its parent, AW, says "Apocalypse World is a storytelling game by Lumpley Games that tells the story of a world in the aftermath of some unknown event." If Dungeon World isn't a story game, then what is?
SSD: @neontapir I'm not sure I could lay it all out. I started out thinking of it as a D&D-storygame, but as I've played and discussed DW more, I see more and more the traditional structure under the rules. So, a non-traditional presentation and structure to generate a traditional game style, perhaps?
I acknowledge the structural similarities. I replied by citing the tag definition from Apocalypse World, which Dungeon World was based on. It states:
Apocalypse World is a storytelling game by Lumpley Games that tells the story of a world in the aftermath of some unknown event.
There is a difference of terminology here between storygame and storytelling game. Are these two terms interchangeable? If not, what are the differences?
Assuming they are synonymous, there is clearly a difference in tone and approach between traditional tabletop RPGs and storytelling games, but both @SevenSidedDie and I struggle to articulate the difference.
What constitutes a story/storytelling game, such as the presence or absence of a certain mechanic? What are some exemplars of this kind of game?