certain vs occurrent

certain

adj
  • Actually existing; sure to happen; inevitable. 

  • Unfailing; infallible. 

  • Known but not specifically named; indeterminate; indefinite; one or some; sometimes used independently as a noun, and meaning certain persons; see also "one". 

  • Fixed or stated; regular; determinate. 

  • Not to be doubted or denied; established as a fact. 

  • Sure, positive, not doubting. 

pron
  • Unnamed or undescribed members (of). 

det
  • Having been determined but not specified. 

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 certain and occurrent occurred in a corpus of books? (source: Google Ngram Viewer )