bookcase vs bookstand

bookcase

noun
  • A piece of furniture for the storage and display of books. 

bookstand

noun
  • A rack for holding books; a bookrack. 

  • A small stall where books are sold. 

  • A stand, made for holding books open. 

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