dripstone vs parasol

dripstone

noun
  • A protective moulding over a door or window that allows rain to drip away from the structure. 

  • Stalactites and stalagmites collectively. 

  • A water filter in which impurities are removed by running water through a porous stone. 

parasol

noun
  • A roof or covering of a structure designed to provide cover from wind, rain, or sun. 

  • A miniature paper umbrella used as a decoration in tropical-themed cocktails. 

  • The parasol mushroom, Macrolepiota procera 

  • A small light umbrella used as protection from the sun. 

  • Any of various Asian species of libellulid dragonfly of the genus Neurothemis. 

verb
  • To protect with, or as if with, a parasol; to shade. 

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