coverall vs duster

coverall and duster both are nouns.

Word	Noun	Adjective	Verb	Adverb
coverall	Yes	No	No	No
duster	Yes	No	No	No

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

coverall: a loose-fitting protective garment that is worn over other clothing
duster: a loose coverall (coat or frock) reaching down to the ankles

Other hyponyms of coverall include dust coat, gabardine, gaberdine, smock, jumper, boilers suit, boilersuit, overall.

coverall (noun)	duster (noun)
a loose-fitting protective garment that is worn over other clothing	a pitch thrown deliberately close to the batter
	a loose coverall (coat or frock) reaching down to the ankles
	a piece of cloth used for dusting
	a windstorm that lifts up clouds of dust or sand