An abstract noun is a type of noun that refers to something with which a person cannot physically interact. A noun is a person, place or thing. However, in many cases, the 'thing' might be an intangible concept – which means it is an abstract form of noun. In this instance, abstract means to exist apart from concrete existence. A noun that is abstract is an aspect, concept, idea, experience, state of being, trait, quality, feeling, or other entity that cannot be experienced with the five senses.

A concrete noun is the name of something or someone that we experience through our senses; sight, hearing, smell, touch or taste. Most nouns are concrete nouns.