boilers suit vs coverall

boilers suit and coverall both are nouns.

Word	Noun	Adjective	Verb	Adverb
boilers suit	Yes	No	No	No
coverall	Yes	No	No	No

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

boilers suit: a loose protective coverall or smock worn over ordinary clothing for dirty work
coverall: a loose-fitting protective garment that is worn over other clothing

boilers suit (noun)	coverall (noun)
a loose protective coverall or smock worn over ordinary clothing for dirty work	a loose-fitting protective garment that is worn over other clothing