penstock /penˈstok/

1. A sluice
2. (in a hydroelectric or other plant) a valve-controlled water conduit

• watch it
• watch key
• watch keys
• watch light
• watch lights
• watch like a hawk
• watch list
• watchmaker
• watchmakers
• watchmaking
• watchmakings
• watchman
• watchman's clock
• watchmen
• watch night
• waterinesses
• watering
• watering-call
• watering-calls
• watering can
• watering cans
• watering-cap
• watering-caps
• watering hole
• watering holes