purr vs snorkel

purr

verb
  • To make a vibrating throaty sound, as from pleasure. 

  • Of a cat, to make a vibrating sound in its throat when contented. 

  • To make a low and consistent rumbling sound. 

  • To say (something) in a throaty, seductive manner. 

noun
  • The vibrating sound made by a cat in its throat when contented. 

  • A throaty, seductive sound of pleasure made by a person. 

  • The low consistent rumble made by an engine at slow speed 

intj
  • Throat vibrating sound made by a cat. 

snorkel

verb
  • To use a snorkel. 

noun
  • A snorkel parka. 

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

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

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