Sunflower seed is called:

Sunflower seeds have the scientific name Helianthus annuus and are botanically known as achenes. The edible part, after the hull is removed, is called the sunflower kernel or heart. For commercial purposes, they are often categorized by their husk color, such as "black oil sunflower seeds" (for oil) or "confectionery sunflower seeds" (for food).