Question: Are tubers and roots the same thing?
Answer: Not exactly
According to Wikipedia (which is always right) there are stem tubers and root tubers. It is a bit confusing that a root tuber is called a tuberous root meaning that it is a root, but has some qualities of a tuber. The common phrasing of root vegetable could refer to either type of tuber so you have to be careful with what you call it. In addition, sweet potatoes and yams are frequently used interchangeably, however a sweet potato is a tuberous root and a yam is a tuber. It is definitely clear as mud.
A little extra reading if you are interested...
http://en.wikipedia.org/wiki/Tuber
http://en.wikipedia.org/wiki/Root_vegetable
As an aside I will be having carrots with my lunch and they are a taproot which is a root, not a tuber. If I were to be having potato for lunch then I would be having a tuber.
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