combinatorial vs combinatory

combinatorial

adj
  • Of, pertaining to, or involving combinations. 

  • Of or pertaining to the combination and arrangement of elements in sets. 

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 combinatorial and combinatory occurred in a corpus of books? (source: Google Ngram Viewer )