caking vs incrustation

caking

noun
  • A layer or deposit of caked material. 

incrustation

noun
  • A crust or hard coating of anything upon or within a body, as a deposit of lime, sediment, etc., from water on the inner surface of a steam boiler. 

  • An accumulated characteristic of a person that disguises their true nature. 

  • Anything inlaid or embedded. 

  • A covering or inlaying of marble, mosaic, etc., attached to the masonry by cramp irons or cement. 

  • The act of incrusting, or the state of being incrusted. 

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