gullet vs oesophagus

gullet

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

  • 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 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. 

oesophagus

noun
  • The tube that carries food from the pharynx to the stomach. 

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