lectern vs rostrum

lectern

noun
  • A stand with a slanted top used to support a bible from which passages are read during a church service. 

  • A similar stand to support a lecturer's notes. 

rostrum

noun
  • A dais, pulpit, or similar platform for a speaker, conductor, or other performer. 

  • A platform for a film or television camera. 

  • The projecting prow of a rowed warship, such as a trireme. 

  • The beak-shaped projection on the head of insects such as weevils. 

  • The snout of a dolphin. 

  • The beak. 

  • The oral or nasal region of a human used for anatomical location (i.e. rostral) 

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