Word Lab
faucet · tap
Usage — not pronunciation
The rule
Faucet and tap name the exact same object — the fixture that controls water flow at a sink or bath. There's no meaning difference, only a regional one: faucet is standard American English, while tap is standard in British, Australian, and most other varieties of English.
Quick tip
One exception both varieties share: "tap water" (water straight from the public supply, not bottled) is standard in American English too — Americans do not say "faucet water."
American English
British / Australian / most other English
Full breakdown
Faucet/tap is one of many everyday American-vs-British vocabulary pairs for the same thing — others include elevator/lift, apartment/flat, trash/garbage vs rubbish, and truck/lorry. None of these are "wrong" in the other dialect; they're just the word that dialect happens to use, so the right choice depends on your audience, not on the object itself.
"Tap" also has uses that are not regional at all, in both American and British English: a beer tap or draft beer "on tap," and the verb "to tap" (tap someone on the shoulder, tap into a resource, tap a phone line). Only the specific meaning "the fixture at a sink" splits along American vs British lines — the other senses of "tap" are shared.
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