coadjuvant vs coincident

coadjuvant

adj

  • cooperating 

noun

  • An adjuvant. 

coincident

adj

  • Being in accordance, matching. 

  • Occurring at the same time. 

  • Being in the same location. 

noun

  • Either of multiple simultaneous related incidents 

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