Proving ground and Test bed

Proving ground noun - A workplace for testing new equipment or ideas.

Test bed and proving ground are semantically related In some cases you can use "Test bed" instead a noun phrase "Proving ground".

Test bed noun - A place equipped with instruments for testing (e.g. engines or machinery or computer programs etc.) under working conditions.

Proving ground and test bed are semantically related in testing structure topic. You can use "Proving ground" instead a noun phrase "Test bed".