Dead air and Noiselessness

Dead air noun - An inadvertent interruption in a broadcast during which there is no sound.

Noiselessness and dead air are semantically related in speech topic. In some cases you can use "Noiselessness" instead a noun phrase "Dead air", when it comes to topics like silence, calmness.

Noiselessness noun - The property of making no noise.

Dead air and noiselessness are semantically related in silence topic. You can use "Dead air" instead a noun "Noiselessness".