Open spaces are areas of land that are not developed or built upon. GAPS, with four letters, is a term used to describe the empty spaces between objects or parts of something. AREAS, with five letters, is a term used to describe a particular portion of space or surface. LEAS, with four letters, is a term used to describe an area of land that is leased or rented out for a specific purpose. Together, these three terms can be used to describe open spaces.