oropharynx vs trachea

oropharynx

noun
  • The oral part of the pharynx, reaching from the uvula to the level of the hyoid bone. 

trachea

noun
  • A thin-walled, cartilaginous tube connecting the larynx to the bronchi. 

  • One of the cuticle-lined primary tubes in the respiratory system of an insect, which extend throughout its body. 

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