snorkel vs whistle

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. 

whistle

noun
  • A device designed to be placed in the mouth and blown, or driven by steam or some other mechanism, to make a whistling sound. 

  • An act of whistling. 

  • A shrill, high-pitched sound made by whistling. 

  • Any high-pitched sound similar to the sound made by whistling. 

  • A suit (from whistle and flute). 

  • The mouth and throat; so called as being the organs of whistling. 

verb
  • To make a shrill, high-pitched sound by forcing air through the mouth. To produce a whistling sound, restrictions to the flow of air are created using the teeth, tongue and lips. 

  • To make a similar sound by forcing air through a musical instrument or a pipe etc. 

  • To move in such a way as to create a whistling sound. 

  • To send, signal, or call by a whistle. 

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