ampulla vs vug

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. 

vug

noun
  • A small to medium-sized cavity inside rock that may be formed through a variety of processes. 

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