Murmuration and Stage whisper

Murmuration noun - A low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech.

Stage whisper and murmuration are semantically related. In some cases you can use "Stage whisper" instead a noun "Murmuration".

Stage whisper noun - A loud whisper that can be overheard; on the stage it is heard by the audience but it supposed to be inaudible to the rest of the cast.

Murmuration and stage whisper are semantically related. Sometimes you can use "Murmuration" instead a noun phrase "Stage whisper".