excavation vs nervure

excavation

noun
  • Something uncovered by archaeological excavation. 

  • Archaeological research that unearths buildings, tombs and objects of historical value. 

  • The act of excavating, or of making hollow, by cutting, scooping, or digging out a part of a solid mass. 

  • An uncovered cutting in the earth, in distinction from a covered cutting or tunnel. 

  • The material dug out in making a channel or cavity. 

  • A site where an archaeological exploration is being carried out. 

  • A cavity formed by cutting, digging, or scooping. 

nervure

noun
  • One of the ribs in a groined vault; a projecting moulding. 

  • A vein in the wing of an insect. 

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