duster vs coverall

duster and coverall both are nouns.

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

As nouns, coverall is a hypernym of duster; that is, coverall is a word with a broader meaning than duster:

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

duster (noun)	coverall (noun)
a pitch thrown deliberately close to the batter	a loose-fitting protective garment that is worn over other clothing
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