all-metal vs metal

all-metal is not a noun while metal is a noun.

Word	Noun	Adjective	Verb	Adverb
all-metal	No	Yes	No	No
metal	Yes	Yes	Yes	No

all-metal (noun)	metal (noun)
	any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
	a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten

all-metal (adjective)	metal (adjective)
consisting completely of metal	containing or made of or resembling or characteristic of a metal

all-metal (verb)	metal (verb)
	cover with metal