Hog havens are structures used to house pigs. The term is made up of four words: PIGSTIES (8 letters), PENS (4 letters), sties (5 letters), and PIGPENS (7 letters). PIGSTIES are small, open-air enclosures with a roof and no walls, while PENS are enclosed structures with walls and a roof. Sties are similar to PIGSTIES but are usually smaller and have a dirt floor. PIGPENS are larger than both sties and PIGSTIES and are typically made of wood or metal. All of these structures provide shelter for pigs and are collectively referred to as hog havens.