Moral:
The moral of the story is the lesson you learn from the story.
Synopsis is:
A brief summary on the plot of a novel, motion picture, play, etc.
Storyboard words:
Write what happens in each scene.
http://www.premiumbeat.com/blog/10-tips-for-creating-storyboards-from-dreamworks/
Treatment:
Is the feel of the game, not the entire story of the game.
http://www.wikihow.com/Write-a-Script-Treatment