glottis vs. epiglottis

noun

Anatomy.

plural

glottises, glottides 
  1. the opening at the upper part of the larynx, between the vocal cords.

noun

Anatomy.

plural

epiglottises, epiglottides 
  1. a thin, valvelike, cartilaginous structure that covers the glottis during swallowing, preventing the entrance of food and drink into the larynx.