Hibernation Place is a term used to describe the location where an animal or person goes to sleep during the winter months. The two most common words used to describe this place are LAIR (4 letters) and DEN (3 letters). A LAIR is typically a cave or a shelter, while a DEN is a small, enclosed space that provides protection from the elements. Both of these terms are used to describe a hibernation place, as they provide a safe and comfortable environment for the animal or person to sleep in during the winter months.