contactual vs side-by-side

contactual

adj
  • Of or relating to contact. 

side-by-side

adj
  • Adjacent; juxtaposed. 

noun
  • Synonym of double rifle. Ellipsis of side-by-side rifle. 

  • Synonym of double-barreled shotgun. Ellipsis of side-by-side shotgun. 

  • A type of multipurpose off-highway utility vehicle, with four wheels, resembling a club cart or a golf cart 

How often have the words contactual and side-by-side occurred in a corpus of books? (source: Google Ngram Viewer )