Starch sources are an important part of many diets around the world. The four crossword solutions for the term starch source are TARO (4 letters), SAGO (4 letters), TUBER (5 letters), and CORN (4 letters). TARO is a root vegetable that is widely cultivated in tropical and subtropical regions. SAGO is a starch extracted from the spongy center, or pith, of various tropical palm stems. TUBER is a type of underground stem that stores energy and nutrients, such as potatoes and yams. Finally, CORN is a cereal grain that is widely grown around the world.