The crossword solution for the term SNACK NUT is PISTACHIO, which is a nine-letter word. Pistachios are a type of nut that is commonly eaten as a snack. They are small, green nuts with a hard shell and a sweet, nutty flavor. Pistachios are native to the Middle East and have been cultivated for thousands of years. They are a popular snack food around the world and are often used in baking and cooking.