coeval vs occurrent

coeval

adj
  • Of the same age; contemporary. 

noun
  • Something of the same era. 

  • Somebody of the same age. 

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