The term 'kind of potato' refers to the various types of potatoes that exist. SWEET potatoes, with five letters, are a type of potato that is sweeter than regular potatoes and has a yellow or orange flesh. IDAHO potatoes, also with five letters, are a type of potato that is grown in the state of IDAHO and is known for its thick skin and creamy texture. IRISH potatoes, also with five letters, are a type of potato that is white-fleshed and is commonly used in mashed potatoes and potato salads. O'Brien potatoes, with six letters, are a type of potato that is usually fried and is often served as a side dish. Lastly, RUSSET potatoes, with six letters, are a type of potato that is characterized by its brown skin and is often used for baking and making French fries.