The difference between "suelo" and "piso".
In lesson 1.13 why do they use the word "suelo" instead of "piso"? Are they pretty much always interchangeable?
"suelo" refers to any kind of flooring/ground. (patio, cement, a yard, brick, earth)
"piso" refers specifically to a man-made floor inside of a building.
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Suelo is used in Spain , and piso is used in most countries of South America , but means the same . In Spain , a piso means a flat too .