canteen vs lacunar

canteen

noun
  • A small cafeteria or snack bar, especially one in a military establishment, school, or place of work. 

  • A temporary or mobile café used in an emergency or on a film location etc. 

  • A military mess kit. 

  • A water bottle, flask, or other vessel, typically used by a soldier or camper as a bottle for carrying water or liquor for drink 

  • A box with compartments for storing eating utensils, silverware etc. 

lacunar

noun
  • A sunken panel or coffer in a ceiling or a soffit. 

  • A ceiling containing panels of this kind. 

adj
  • Of or pertaining to a lacuna 

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