A main longitudinal structure along the bottom of the sailboat called the keel. This is what prevents it from tipping over.
Capsize
Turtle, that is what you call it when you tip your sailboat upside down
It is very possible to tip over a canoe. Some poeple use what are called outriggers which can be attached to a canoe in order to make it more stable and less likely to tip over.
A junk.
dhow
It is called the lateen sail.
That would be the deck.
the keel
Is called a mast
The Most expensive sailboat costs over 126 dollars
It's is called a 'tooltip'.