esophagus vs passageway

esophagus and passageway both are nouns.

Word	Noun	Adjective	Verb	Adverb
esophagus	Yes	No	No	No
passageway	Yes	No	No	No

As nouns, passageway is a hypernym of esophagus; that is, passageway is a word with a broader meaning than esophagus:

esophagus: the passage between the pharynx and the stomach
passageway: a path or channel or duct through or along which something may pass

Other hypernyms of esophagus include passage, muscle system, muscular structure, musculature.

esophagus (noun)	passageway (noun)
the passage between the pharynx and the stomach	a passage between rooms or between buildings
	a path or channel or duct through or along which something may pass