They are closely related members of the same family of plants, Solanaceae.
Their Taste.
They're both starches.
veggies
They both grow.
Not all are. While the common Idaho brown potatoes are typically extended in one direction, some other potatoes (notably the red and "new potatoes") are round in shape.
potatoes and onions
Maine
Bread, potatoes, McDonalds !
Potatoes
corn and potatoes
They can all be hot.
potatoes, tomatoes, broccoli, sprouts
brown a gooey
chitin
Potatoes, corn, broccoli, peas, and green beans are very common vegetables.