highness vs promontory

highness

noun
  • The state of being high. 

  • A title of respect when referring to a prince or princess. 

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. 

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