wire vs piano wire

wire and piano wire both are nouns.

Word	Noun	Adjective	Verb	Adverb
wire	Yes	No	Yes	No
piano wire	Yes	No	No	No

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

wire: ligament made of metal and used to fasten things or make cages or fences etc
piano wire: thin steel wire of high tensile strength

Other hyponyms of wire include baling wire, barbed wire, barbwire, haywire, trip wire.

wire (noun)	piano wire (noun)
ligament made of metal and used to fasten things or make cages or fences etc	thin steel wire of high tensile strength
a metal conductor that carries electricity over a distance
a message transmitted by telegraph
the finishing line on a racetrack

wire (verb)	piano wire (verb)
equip for use with electricity
send cables, wires, or telegrams
fasten with wire
string on a wire
provide with electrical circuits