promontory vs waypost

promontory

noun
  • A projection on the sacrum. 

  • A rounded elevation in the tympanum of the ear. 

  • A high point of land extending into a body of water, headland; cliff. 

waypost

noun
  • A sign or other marker that indicates the way along a road or trail. 

  • Something that guides or marks the way along a figurative journey; a temporary stopping point. 

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