rum vs top-shelf

rum

noun
  • Coordinate term: grog 

  • The card game rummy. 

  • A serving of rum. 

  • A kind or brand of rum. 

  • A distilled spirit derived from fermented cane sugar and molasses. 

top-shelf

How often have the words rum and top-shelf occurred in a corpus of books? (source: Google Ngram Viewer )