escape hatch vs hatchway

escape hatch and hatchway both are nouns.

Word	Noun	Adjective	Verb	Adverb
escape hatch	Yes	No	No	No
hatchway	Yes	No	No	No

As nouns, hatchway is a hypernym of escape hatch; that is, hatchway is a word with a broader meaning than escape hatch:

escape hatch: hatchway that provides a means of escape in an emergency
hatchway: an entrance equipped with a hatch; especially a passageway between decks of a ship

Other hypernyms of escape hatch include opening, scuttle.

escape hatch (noun)	hatchway (noun)
hatchway that provides a means of escape in an emergency	an entrance equipped with a hatch; especially a passageway between decks of a ship