berth vs loosen

berth

verb
  • To use a device to bring a spaceship into its berth/dock 

  • to bring (a ship or vehicle) into its berth/berthing 

  • to assign a berth (bunk or position) to 

noun
  • A room in which a number of the officers or ship's company mess and reside. 

  • position on the field of play 

  • Room for maneuvering or safety. (Often used in the phrase a wide berth.) 

  • A job or position, especially on a ship. 

  • Position or seed in a tournament bracket. 

  • A fixed bunk for sleeping (in caravans, trains, etc). 

  • A space for a ship to moor or a vehicle to park. 

loosen

verb
  • To disengage (a device that restrains). 

  • To make loose. 

  • To free from restraint; to set at liberty. 

  • To become unfastened or undone. 

  • To relieve (the bowels) from constipation; to promote defecation. 

  • To become loose. 

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