co-pilot vs copilot

co-pilot

noun

  • Britain standard spelling of copilot. 

verb

  • Britain standard spelling of copilot. 

copilot

verb

  • To serve as relief or assistant pilot. 

noun

  • A backup or assistant pilot of an aircraft. 

How often have the words co-pilot and copilot occurred in a corpus of books? (source: Google Ngram Viewer )