combinative vs combinatory

combinative

adj
  • Of, pertaining to, or resulting from combination. 

  • Serving, tending, or able to combine. 

combinatory

adj
  • Of, relating to, or derived from a combination or combinations; combinative or combinatorial. 

  • Having the ability to combine; combinable, combinational or combining. 

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