water faucet vs water tap

water faucet and water tap both are nouns.

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

As nouns, water faucet and water tap are synonyms defined as:

water faucet and water tap: a faucet for drawing water from a pipe or cask

Other synonyms of water faucet include hydrant, tap.

water faucet (noun)	water tap (noun)
a faucet for drawing water from a pipe or cask	a faucet for drawing water from a pipe or cask