sewer vs snorkel

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. 

snorkel

noun
  • A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater. 

  • A snorkel parka. 

  • A retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth. 

verb
  • To use a snorkel. 

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