Susurrus and Undertone

Susurrus noun - The indistinct sound of people whispering.

Undertone and susurrus are semantically related. in murmur topic. In some cases you can use "Undertone" instead a noun "Susurrus".

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

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