flashing vs sheet metal

flashing and sheet metal both are nouns.

Word	Noun	Adjective	Verb	Adverb
flashing	Yes	No	No	No
sheet metal	Yes	No	No	No

As nouns, sheet metal is a hypernym of flashing; that is, sheet metal is a word with a broader meaning than flashing:

flashing: sheet metal shaped and attached to a roof for strength and weatherproofing
sheet metal: sheet of metal formed into a thin plate

flashing (noun)	sheet metal (noun)
sheet metal shaped and attached to a roof for strength and weatherproofing	sheet of metal formed into a thin plate
a short vivid experience