Death chamber and Instrument of execution

Death chamber noun - Instrument of execution consisting of a sealed chamber into which poison gas is introduced; used to kill people or animals.

Instrument of execution and death chamber are semantically related. In some cases you can use "Instrument of execution" instead a noun phrase "Death chamber".

Instrument of execution noun - An instrument designed and used to take the life of a condemned person.

Death chamber and instrument of execution are semantically related. Sometimes you can replace phrase "Death chamber" with "Instrument of execution", this phrases are similar.