Reservoir and Receptacle

Reservoir noun - The number of individuals or amount of something available at any given time.

Receptacle is a synonym for reservoir in accumulation topic. In some cases you can use "Receptacle" instead a noun "Reservoir", when it comes to topics like vessel, repository.

Receptacle noun - Something into which a liquid or smaller objects can be put for storage or transportation.

Reservoir is a synonym for receptacle in vessel topic. You can use "Reservoir" instead a noun "Receptacle".