spiracle vs upcast

spiracle

noun
  • Any small aperture or vent for air or other fluid. 

  • A pore or opening used (especially by arthropods and some fish) for respiration. 

  • The blowhole of a whale, dolphin or other similar species. 

upcast

noun
  • The ventilating shaft of a mine out of which the air passes after having circulated through the mine. 

  • A cast; a throw. 

  • A taunt; a reproach. 

  • A cast from subtype to supertype. 

  • An upset, as from a carriage. 

  • A message transmitted via upcasting. 

  • A current of air passed along such a shaft. 

adj
  • Cast up; thrown upward. 

verb
  • To taunt; to reproach; to upbraid. 

  • To cast from subtype to supertype. 

  • To broadcast a message or data to aircraft or satellites, especially via radio waves; as opposed to uplinking to a specific satellite or aircraft 

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