gullet vs watercourse

gullet

noun
  • A channel for water. 

  • A preparatory cut or channel in excavations, of sufficient width for the passage of earth wagons. 

  • The throat or esophagus. 

  • The cytopharynx of a ciliate, through which food is ingested. 

  • The space between the teeth of a saw blade. 

  • The wide space under the pommel of a saddle; the hollow over the withers of a saddled animal. 

watercourse

noun
  • Any channel, either natural or artificial, through which water flows. 

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