flue vs stoma

flue

noun
  • In an organ flue pipe, the opening between the lower lip and the languet. 

  • A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace). 

  • An enclosed passageway in which to direct air or other gaseous current along. 

stoma

noun
  • A mouthlike opening, such as the oral cavity of a nematode. 

  • One of the tiny pores in the epidermis of a leaf or stem through which gases and water vapor pass. 

  • A small opening in a membrane; a surgically constructed opening, especially one in the abdominal wall that permits the passage of waste after a colostomy or ileostomy. 

  • An artificial anus. 

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