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"Son" is a form of "son", a noun which is often translated as "el hijo". "Hay" is a noun which is often translated as "el heno". Learn more about the difference between "son" and "hay" below.
son()
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
1. (relative)
hay()
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).