occurrent vs perdurant

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. 

perdurant

noun
  • A happening; an entity that only exists partially at any given point in time. 

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