Ruler's Domain is a term used to describe the area of land or territory that is controlled by a ruler or monarch. The crossword solutions for this term are FOOT (4 letters), ROOST (5 letters), and REALM (5 letters). FOOT is a unit of length, usually equal to 12 inches or one-third of a yard. ROOST is a place where birds or other animals rest or sleep. REALM is a kingdom or domain ruled by a monarch. Together, these three words can be used to describe the area of land or territory that is controlled by a ruler or monarch.