ampulla vs archenteron

ampulla

noun
  • The dilated end of a duct. 

  • An Ancient Roman two-handled vessel. 

  • A vessel for containing consecrated wine or oil. 

  • The spongiole of a root. 

archenteron

noun
  • A primitive alimentary cavity 

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