This is why I said "if it's got a user-friendly valve," like if you press a button (and a stream shoots up to your lips to drink), wiggle a stem so water falls down (on your hands to wash), step on a lever (and the flow begins)...yeah, these things have a knob / lever / valve (maybe it rotates, maybe it needs to be "pressed"): these are water_taps. You might wash your hands, you might flow gently upwards in an arc for your lips, you might cause a light flow to drip or flow downward. The "valve" (of many sorts), makes it a "tap."
I'll add to this list all those taps that can be activated without a direct manipulation of an object, such as passing your hand in front of a light ray which causes the water to start flowing.
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