cask vs solera

cask

noun
  • A large barrel for the storage of liquid, especially of alcoholic drinks. 

verb
  • To put into a cask. 

solera

noun
  • A large wine cask, on the bottom tier in this system, that contains the oldest wine 

  • A method of producing sherry in which small amounts of younger wines stored in an upper tier of casks are systematically blended with the more mature wine in the casks below 

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