akin vs combinative

akin

adj
  • Allied by nature; similar; partaking of the same properties; of the same kind. 

  • Of the same kin; related by blood. 

combinative

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

  • Serving, tending, or able to combine. 

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