happenstance vs occurrent

happenstance

noun
  • A chance or random event or circumstance. 

  • The chance or random quality of an event or circumstance. 

occurrent

noun
  • An event, something that occurs. 

  • One who comes to meet another. 

adj
  • Pertaining to occurrence; having to do with an occurrence. 

  • Current, actual, occurring. 

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