The term 'SQUIRREL's Hoard' refers to the collection of NUTS that a SQUIRREL stores away for later use. This is a common behavior among squirrels, as they are known to collect and store food for the winter months when food is scarce. The crossword solution for this term is 'NUTS', which is a four-letter word. NUTS are a type of hard-shelled seed that can be found in a variety of trees and plants. Squirrels are known to eat a variety of NUTS, including acorns, walnuts, hazelnuts, and almonds.