noun
Refers to a water supply valve, such as a fire hydrant or an outdoor tap. Often used in technical or municipal contexts.
消防士は給水栓を開けてホースをつないだ。
The firefighter opened the hydrant and connected the hose.
公園の給水
I washed my hands at the tap in the park.
蛇口 is the common word for a household faucet or tap, whereas 給水栓 is more technical and often refers to outdoor or municipal water outlets.
Compound of 給水 (water supply) and 栓 (plug, valve). The exact historical derivation is uncertain, but the word is a straightforward technical term.