noun

• (grammar, strictly) A word that functions as the name of a specific object or set of objects, such as person, animal, place, word, thing, phenomenon, substance, quality, or idea: one of the basic parts of speech in many languages, including English.
  "Records have been broken, races have been dedicated, dreams have been dreamed, starts have been falsed and nouns have been verbed."
• (grammar, now rare, loosely) Either a word that can be used to refer to a person, animal, place, thing, phenomenon, substance, quality or idea, or a word that modifies or describes a previous word or its referent; a substantive or adjective, sometimes also including other parts of speech such as numeral or pronoun.
  "Q. What is a Noun? A. The Name of a Thing. Q. How many Sorts of Nouns are there? [...] A. A Noun Substantive, and a Noun Adjective."
• (computing) An object within a user interface to which a certain action or transformation (i.e., verb) is applied.
  "Nouns are the data; verbs are the data transformations, and therefore verbs represent much of the complexity of systems."

verb

• (transitive) To convert a word to a noun.
  "What is not clear is how the nouning of verbs supports Simon's assumed correspondence between mechanical designing and intentional human responses. Is it the very nouning of verbs which indicates that the above correspondence exists?"