associational vs conjoined

associational

adj
  • Of, pertaining to or deriving from association. 

conjoined

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

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

  • Combined. 

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