Open space is a term used to describe an AREA of land that is not developed or built upon. A GAP (3 letters) is a small opening or break in something, such as a wall or fence. A GLADE (5 letters) is a grassy open AREA in a forest. An AREA (4 letters) is a particular geographical region or part of a country. A RIFT (4 letters) is a crack or split in the earth's surface. A RANGE (5 letters) is a series of mountains or hills. CLEARANCE (9 letters) is the act of removing something from a place. INTERSTICE (10 letters) is a small space between things.