ambo vs bookstand

ambo

noun
  • A stationary podium used for readings and homilies. 

  • An ambulance driver. 

  • A raised platform in an early Christian church, as well as in the Eastern Orthodox, Oriental Orthodox, and Eastern Catholic churches. 

  • An ambulance. 

bookstand

noun
  • A stand, made for holding books open. 

  • A small stall where books are sold. 

  • A rack for holding books; a bookrack. 

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