faucet vs water faucet

faucet and water faucet both are nouns.

Word	Noun	Adjective	Verb	Adverb
faucet	Yes	No	No	No
water faucet	Yes	No	No	No

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

Other hyponyms of faucet include mixing faucet, cock, stopcock, turncock, hydrant, tap, water tap.

faucet (noun)	water faucet (noun)
a regulator for controlling the flow of a liquid from a reservoir	a faucet for drawing water from a pipe or cask