attendant vs coöccurrence

attendant

noun
  • That which accompanies or follows. 

  • One who attends; one who works with or watches over something. 

  • A servant or valet. 

  • One who owes a duty or service to another. 

adj
  • Depending on, or owing duty or service to. 

  • Going with; associated; concomitant. 

coöccurrence

noun
  • The fact of a thing occurring simultaneously with something else; correlation. 

  • An instance of a thing occurring simultaneously with something else; coïncidence. 

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