faucet vs stopcock

faucet and stopcock both are nouns.

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

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

faucet: a regulator for controlling the flow of a liquid from a reservoir
stopcock: faucet consisting of a rotating device for regulating flow of a liquid

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

faucet (noun)	stopcock (noun)
a regulator for controlling the flow of a liquid from a reservoir	faucet consisting of a rotating device for regulating flow of a liquid