existent vs occurrent

existent

adj
  • existing; having life or being, current; occurring now 

occurrent

adj
  • Current, actual, occurring. 

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

noun
  • An event, something that occurs. 

  • One who comes to meet another. 

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