axial vs focal

axial

adj
  • Relating to, resembling, or situated on an axis 

  • Belonging to the axis of the body, or to the axis of any appendage or organ 

  • In the same direction as the axis, parallel to the axis. 

  • oriented close to the axis running through the centre of a cyclohexane ring, as opposed to equatorial. See w:Axial bond. 

noun
  • A plane parallel to the surface of a tooth. 

  • A flight feather that appears between the primaries and secondaries on some birds. 

focal

adj
  • Belonging to, concerning, or located at a focus. 

  • Limited to a small area. 

noun
  • The individual who is the focus of a study or review, when the study or review is based on that individual's interactions with others. 

  • The central or most important element of something; a focal element. 

  • A sign or similar type of marketing material designed to draw attention to special deals. 

  • An object that is used to focus concentration when performing magic. 

  • A representative of a group or class of people within an organizational system. 

  • An exemplar of a concept. 

  • A major point of interest; an attraction. 

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