nomenclature vs screen name

nomenclature

noun
  • A set of names or terms. 

  • A set of rules used for forming the names or terms in a particular field of arts or sciences. 

screen name

noun
  • Synonym of stage name 

  • a pseudonym used for Internet communications 

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