dust coat vs coverall

dust coat and coverall both are nouns.

Word	Noun	Adjective	Verb	Adverb
dust coat	Yes	No	No	No
coverall	Yes	No	No	No

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

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

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