sweet potato VS yam?

okay so I need help to win an argument.  My friend keeps insisting that they are 2 different kinds of potato.  I always thought they were the same potato called by a different name.

Can anyone help settle this strange debate?

Thanks

Wiki to the rescue:http://en.wikipedia.org/wiki/Yam_(vegetable)

UD

Please see this link for the differences between sweet potatoes and yams, they are not even related species. Although where I live in the American South the two terms are used interchangeably.

http://homecooking.about.com/od/howtocookvege tables/a/sweetpotatodiff.htm

mmm both are delicious! ..you HAVE to try sweet potato fries their awesome we call sweet potatoes Kumura here

Original Post by jayjay11:

mmm both are delicious! ..you HAVE to try sweet potato fries their awesome we call sweet potatoes Kumura here

ohmigod i looove these!!