exterior vs periphery

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. 

periphery

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

  • A first-rank administrative division of Greece, subdivided into provinces. 

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