interior vs outskirts

interior

noun
  • The set of all interior points of a set. 

  • The inside regions of a country, distanced from the borders or coasts. 

  • The inside of a building, container, cavern, or other enclosed structure. 

adj
  • Within any limits, enclosure, or substance; inside; internal; inner. 

  • Remote from the limits, frontier, or shore; inland. 

outskirts

noun
  • The area surrounding a city or town; suburb. 

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