It is common practice to use an abstract noun when referring to things that cannot be heard, seen, tasted or felt. In contrast to concrete nouns, abstract nouns lack substance. A significant number of proverbs make use of intangible nouns.
An abstract noun is “a noun, for example, beauty or freedom, that refers to an idea or a general quality, and not to a physical object,” as defined by the Oxford Learners Dictionary. An abstract noun is a noun that does not refer to a concrete thing but rather to an idea or a quality,