reservoir /rezˈər-vwär or -vwör/

1. A receptacle
2. A store
3. A receptacle for fluids, esp a large basin, artificial lake or tank for storing water

To store

reservoir rock noun

Porous rock containing producible oil and/or gas

• whombles
• whombling
• whomever
• whommle
• whommled
• whommles
• whommling
• whomsoever
• whoobub
• whoobubs
• whoop
• whooped
• whoopee
• whoopee cushion
• whoopee cushions
• whoopees
• whooper
• whoopers
• whooper swan
• whooper swans
• whooping
• whooping cough
• whooping crane
• whooping cranes
• whoopings