coverall vs gabardine

coverall and gabardine both are nouns.

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

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

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

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

coverall (noun)	gabardine (noun)
a loose-fitting protective garment that is worn over other clothing	a firm durable fabric with a twill weave
	a loose coverall (coat or frock) reaching down to the ankles
	(usually in the plural) trousers made of flannel or gabardine or tweed or white cloth