hoodmould vs stalagmite

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. 

stalagmite

noun
  • A secondary mineral deposit of calcium carbonate or other mineral, in shapes similar to icicles, that lies on the ground of a cave. 

  • Coordinate term: stalactite 

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