happenchance vs happenstance

happenchance

noun

  • Coincidence. 

adj

  • Characterized by happenstance; chance; fortunate or unfortunate. 

happenstance

noun

  • A chance or random event or circumstance. 

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

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