exterior vs focal

exterior

noun
  • The outside part, parts or surface of something. 

  • Foreign lands. 

adj
  • Being from outside a country; foreign. 

  • Outdoor. 

  • Relating to the outside parts or surface of something. 

focal

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

  • 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. 

  • 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. 

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

  • Limited to a small area. 

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