coverall vs boilersuit

coverall and boilersuit both are nouns.

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

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

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

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

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