The crossword solution for the term 'BEAR'S SHELTER' is DEN, which is a three-letter word. A DEN is a shelter or refuge that is used by animals, such as bears, to protect themselves from predators and the elements. It is usually a small, dark, and enclosed space, such as a cave, hollow tree, or burrow. Bears use dens to hibernate during the winter months, and they may also use them to give birth and raise their young.