What kind vegetables are cassava yam sweet potatoes?

It seems you're trying to group together different types of starchy root vegetables! Here's a breakdown:

* Cassava is a starchy root vegetable. It's also sometimes called yuca, but it's not related to yams.

* Yam is a starchy tuber. True yams are quite different from the sweet potatoes we find in the grocery store.

* Sweet potatoes are a starchy root vegetable that are related to morning glories.

While these foods are all starchy root vegetables, they are not all the same type. Here's a more accurate way to categorize them:

Starchy Root Vegetables:

* Cassava (yuca)

* Sweet Potato

Starchy Tubers:

* Yam (true yams are rarely found in North America)

Let me know if you have any other questions about these or other vegetables!