holster vs vessel

holster

verb
  • To put something in a holster. 

noun
  • A belt with loops or slots for carrying small tools or other equipment. 

  • A case for carrying a tool, particularly a gun, safely and accessibly. 

vessel

verb
  • To put into a vessel. 

noun
  • A craft designed for transportation through air or space. 

  • Any craft designed for transportation on water, such as a ship or boat. 

  • A container of liquid or other substance, such as a glass, goblet, cup, bottle, bowl, or pitcher. 

  • A tube or canal that carries fluid in an animal or plant. 

  • A person as a container of qualities or feelings. 

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