cloaca vs sewer

cloaca

noun
  • A sewer. 

  • A duct through which gangrenous material escapes a body. 

  • 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. 

sewer

noun
  • A pipe or system of pipes used to remove human waste and to provide drainage. 

  • One who sews. 

  • A small tortricid moth, the larva of which sews together the edges of a leaf using silk. 

  • A servant attending at a meal who is responsible for seating arrangements, serving dishes, etc. 

verb
  • To provide (a place) with a system of sewers. 

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