Open space is a term that refers to a piece of land that is not built-up or is left undeveloped. It is a type of land that is usually devoid of any kind of construction and can be used for various purposes. Some of the synonyms for open space include green space, outdoor space, parkland, wilderness, public space, and garden. Green space refers to any land that is dedicated to preserving and improving the natural environment. Outdoor space is a general term that describes any kind of space that is open and accessible to the public. Parkland refers to any open space that is designated for recreational activities. Wilderness is an area of land that is largely untouched by human activities while Public space refers to any land that is accessible to the public. Garden refers to an area of land that is cultivated for growing different kinds of plants and flowers.