cloaca vs vas

cloaca

noun
  • A duct through which gangrenous material escapes a body. 

  • A sewer. 

  • The duct in reptiles, amphibians and birds, as well as most fish and some mammals, which serves as the common outlet for urination, defecation, and reproduction. 

  • An outhouse or lavatory. 

vas

noun
  • A vessel or duct transporting any bodily fluid, such as blood, lymph, chyle, or semen. 

  • The vas deferens. 

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