shutter vs deadlight

shutter and deadlight both are nouns.

Word	Noun	Adjective	Verb	Adverb
shutter	Yes	No	Yes	No
deadlight	Yes	No	No	No

As nouns, deadlight is a hyponym of shutter; that is, deadlight is a word with a more specific, narrower meaning than shutter:

shutter: a hinged blind for a window
deadlight: a strong shutter over a ship's porthole that is closed in stormy weather

Other hyponyms of shutter include jalousie.

shutter (noun)	deadlight (noun)
a hinged blind for a window	a strong shutter over a ship's porthole that is closed in stormy weather
a mechanical device on a camera that opens and closes to control the time of a photographic exposure

shutter (verb)	deadlight (verb)
close with shutters