glottis vs gula

glottis

noun
  • The opening between the true vocal cords which is located in the larynx and affects voice modulation through expansion or contraction. 

gula

noun
  • The upper front of the neck, next to the chin; the upper throat. 

  • A capping moulding; a cymatium. 

  • A plate which in most insects supports the submentum. 

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