byword vs noun

byword

noun
  • A characteristic word or expression; a word or phrase associated with a person or group. 

  • A nickname or epithet. 

  • Someone or something that stands as an example (i.e. metonymically) for something else, by having some of that something's characteristic traits. 

  • A proverb or proverbial expression, common saying; a frequently used word or phrase. 

  • An object of notoriety or contempt, scorn or derision. 

noun

noun
  • A word that functions as the name of a specific object or set of objects, such as person, animal, place, thing, phenomenon, substance, quality, or idea; one of the basic parts of speech in many languages, including English. 

  • An object within a user interface to which a certain action or transformation (i.e., verb) is applied. 

verb
  • To convert a word to a noun. 

How often have the words byword and noun occurred in a corpus of books? (source: Google Ngram Viewer )