Hens' Pens is a term used to describe the enclosures that are used to house chickens. These pens are typically made of wood or wire mesh and provide a safe and secure environment for the birds. They are also designed to keep predators out and provide a comfortable living space for the birds. COOPS, which is the five letter crossword solution, is another term for these enclosures and is often used interchangeably with Hens' Pens.