anon vs bis

anon

adv
  • At another time; then; again. 

  • Soon; in a little while. 

adj
  • anonymous 

noun
  • An anonymous person, especially an author. 

  • A work with an unknown author. 

  • A work without a title. 

bis

adv
  • Twice; showing that something is, or is to be, repeated, such as a passage of music, or an item in accounts. 

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