japer vs madcap

japer

noun

  • One who japes; a joker. 

madcap

noun

  • An impulsive, hasty, capricious person. 

adj

  • Hasty, impulsive, or reckless; capricious. 

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