nostril vs rostrum

nostril

noun
  • Either of the two orifices located on the nose (or on the beak of a bird); used as a passage for air and other gases to travel the nasal passages. 

rostrum

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

  • 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. 

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