exocarp vs exterior

exocarp

noun
  • The outermost layer of the pericarp of fruits; the skin or epicarp 

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. 

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