anon vs some day

anon

adv

  • Soon; in a little while. 

  • At another time; then; again. 

adj

  • anonymous 

noun

  • An anonymous person, especially an author. 

  • A work with an unknown author. 

  • A work without a title. 

some day

adv

  • An unspecified day in the future. 

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