Basement
Basement noun - A room or set of rooms below the surface of the ground.
Ground floor and basement are semantically related in first floor topic. In some cases you can use "Ground floor" instead a noun "Basement".
Ground floor
Ground floor noun - The floor of a building that is at or nearest to the level of the ground around the building.
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Synonyms for Ground floor
Basement and ground floor are semantically related in first floor topic. You can use "Basement" instead a noun phrase "Ground floor".
Mutual synonyms
Both terms in one sentence
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However, in America, the main floor IS the first floor* (exceptions exist, usually if the main entrance is not on the ground floor and the ground floor isn't really a basement).
Source: We All Live in America -
Buildings in downtown Milwaukee typically have "basement", "ground floor", and "first floor".
Source: My Hero Zero
Cite this Source
Ground floor and Basement. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/basement/ground_floor
Basement & Ground floor. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/basement/ground_floor>.
Ground floor or Basement. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/basement/ground_floor.
Google Ngram Viewer shows how "basement" and "ground floor" have occurred on timeline