Murmuration and Undertone

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

Undertone and murmuration are semantically related. in low topic. In some cases you can use "Undertone" instead a noun "Murmuration", when it comes to topics like murmur.

Undertone noun - A subdued emotional quality underlying an utterance; implicit meaning.

Murmuration and undertone are semantically related. You can use "Murmuration" instead a noun "Undertone".