epicardia vs passageway

epicardia and passageway both are nouns.

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

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

epicardia: the short part of the esophagus extending downward from the diaphragm to the stomach
passageway: a path or channel or duct through or along which something may pass

Other hypernyms of epicardia include passage.

epicardia (noun)	passageway (noun)
the short part of the esophagus extending downward from the diaphragm to the stomach	a passage between rooms or between buildings
	a path or channel or duct through or along which something may pass