Explanation
A noun that refers to something that can be directly perceived by the senses, such as baby, frog, or skyscraper. Concrete nouns express a different type of meaning from abstract nouns like sadness.
It is debatable whether non-tangible things that can be perceived by the senses, such as sound, are concrete. Nouns like pain can be seen as having a concrete meaning ("physical pain" perceived by the senses) and an abstract meaning ("emotional pain" not perceived by the senses).
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