interior vs internal

interior

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

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

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. 

internal

adj
  • Of or situated on the inside. 

  • Within the body. 

  • Concerned with the domestic affairs of a nation, state or other political community. 

  • Of the inner nature of a thing. 

  • Applied or intended for application through the stomach by being swallowed. 

  • Concerned with the non-public affairs of a company or other organisation. 

  • Attending a university as well as taking its examinations. 

  • Experienced in one's mind; inner rather than expressed. 

  • Present or arising within an organism or one of its parts. 

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