coexistence vs usual

coexistence

noun
  • The state of two or more things existing together, usually in a temporal or spatial sense, with or without mutual interaction. 

usual

noun
  • The typical state of something, or something that is typical. 

  • A specific good or service (e.g. a drink) that someone typically orders. 

adj
  • Most commonly occurring; typical. 

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