airlock vs passage

airlock

noun
  • A vestibule, foyer or entranceway with doors to the exterior on one end and doors to the interior on the other, functioning to keep indoor and outdoor air, humidity, and air temperatures separate. 

  • A sealed, airtight chamber, such as in a manned spacecraft or submarine, used to provide access to and from the sealed area without allowing air out or water in. 

passage

noun
  • A passageway or corridor. 

  • An incident or episode. 

  • A gambling game for two players using three dice, in which the object is to throw a double over ten. 

  • A movement in classical dressage, in which the horse performs a very collected, energetic, and elevated trot that has a longer period of suspension between each foot fall than a working trot. 

  • A fee paid for passing or for being conveyed between places. 

  • The act of passing; movement across or through. 

  • Part of a path or journey. 

  • A paragraph or section of text or music with particular meaning. 

  • The right to pass from one place to another. 

  • Serial passage. 

  • A strait or other narrow waterway. 

  • The official approval of a bill or act by a parliament. 

  • The advance of time. 

  • The vagina. 

  • The use of tight brushwork to link objects in separate spatial plains. Commonly seen in Cubist works. 

  • An underground cavity, formed by water or falling rocks, which is much longer than it is wide. 

verb
  • To execute a passage movement. 

  • To pass something, such as a pathogen or stem cell, through a host or medium. 

  • To make a passage, especially by sea; to cross. 

adj
  • Of a bird: Less than a year old but living on its own, having left the nest. 

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