aerophagia vs deglutition

aerophagia and deglutition both are nouns.

Word	Noun	Adjective	Verb	Adverb
aerophagia	Yes	No	No	No
deglutition	Yes	No	No	No

As nouns, deglutition is a hypernym of aerophagia; that is, deglutition is a word with a broader meaning than aerophagia:

aerophagia: swallowing air (usually followed by belching and discomfort and flatulence)
deglutition: the act of swallowing

Other hypernyms of aerophagia include drink, swallow.

aerophagia (noun)	deglutition (noun)
swallowing air (usually followed by belching and discomfort and flatulence)	the act of swallowing