cache vs lacunar

cache

noun
  • A container containing treasure in a global treasure-hunt game. 

  • A fast temporary storage where recently or frequently used information is stored to avoid having to reload it from a slower storage medium. 

  • A store of things that may be required in the future, which can be retrieved rapidly, protected or hidden in some way. 

verb
  • To place in a cache. 

  • To store data in a cache. 

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 cache and lacunar occurred in a corpus of books? (source: Google Ngram Viewer )