interior vs labium

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. 

labium

noun
  • The lip of a labiate corolla. 

  • A liplike structure; especially one of the two pairs of folds of skin on either side of the vulva. 

  • A liplike part of various invertebrates. 

  • The lip against which pressured air is driven to produce sound in a recorder and in a pipe organ with flue pipes. 

  • A lower mouthpart of an insect that is formed by the second pair of maxillae united in the middle line. 

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