cassava: a starch made by leaching and drying the root of the cassava plant; the source of tapioca; a staple food in the tropics
starch: a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice; an important foodstuff and used otherwise especially in adhesives and as fillers and stiffeners for paper and textiles