bituminize vs caulk

bituminize

verb
  • to treat with bitumen 

caulk

verb
  • To apply caulking to joints, cracks, or a juncture of different materials. 

  • To drive oakum into the seams of a ship's wooden deck or hull to make it watertight. 

  • To copulate. 

noun
  • A composition of vehicle and pigment used at ambient temperatures for filling/sealing joints or junctures, that remains elastic for an extended period of time after application. 

  • Caulking. 

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