glide vs snorkel

glide

verb
  • To pass with a glide, as the voice. 

  • To cause to glide. 

  • To move softly, smoothly, or effortlessly. 

  • To fly unpowered, as of an aircraft. Also relates to gliding birds and flying fish. 

noun
  • An attack or preparatory movement made by sliding down the opponent’s blade, keeping it in constant contact. 

  • A bird, the glede or kite. 

  • The joining of two sounds without a break. 

  • A transitional sound, especially a semivowel. 

  • A smooth and sliding step in dancing the waltz. 

  • The act of gliding. 

  • A kind of cap affixed to the base of the legs of furniture to prevent it from damaging the floor. 

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 glide and snorkel occurred in a corpus of books? (source: Google Ngram Viewer )