combinative vs conjoined

combinative

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

  • Serving, tending, or able to combine. 

conjoined

adj
  • Combined. 

  • Joined together physically, of persons (conjoined twins), or things. 

  • Joined or bound together; united (in a relationship) 

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