flue vs inlet

flue

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

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

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

inlet

noun
  • A passage that leads into a cavity. 

  • A body of water let into a coast, such as a bay, cove, fjord or estuary. 

verb
  • To let in; admit. 

  • To carve the wooden stock of a firearm so as to position the metal components in it. 

  • To insert; inlay. 

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