aqueduct vs sewer

aqueduct

noun
  • An artificial channel that is constructed to convey water from one location to another. 

  • A structure carrying water over a river or depression, especially in regards to ancient aqueducts. 

  • A structure conveying fluid, such as the cerebral aqueduct or vestibular aqueduct. 

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 aqueduct and sewer occurred in a corpus of books? (source: Google Ngram Viewer )