The term CRUNCH SOURCE can be broken down into two crossword solutions, NUTS (4 letters) and NESTE (5 letters). NUTS is a common term for edible seeds or fruits that have a hard outer shell, such as peanuts, almonds, walnuts, and cashews. NESTE is a Finnish oil refining and marketing company that produces and sells petroleum products. Both of these terms can be used to describe a source of crunchy texture.