hoodmould vs stalactite

hoodmould

noun
  • The outermost moulding which protrudes out of a wall over an archway (over the hood of a door, window or other opening), for decoration or the cover transitions between surfaces, and to discharge rain; a dripstone. 

stalactite

noun
  • A secondary mineral deposit of calcium carbonate or another mineral, in shapes similar to icicles, that hangs from the roof of a cave. 

  • Coordinate term: stalagmite 

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