We can create it by clapping our hands, speaking or turning on the radio. It is measured in decibels. Silence, on the other hand, is the absence of sound. It is a non-entity. Light and darkness are probably the best examples.
Light is the entity.
We can create it by striking a match or flicking a switch. Darkness, on the other hand, is the non-entity. It is only manifested when the light or its source in removed. We measure light in watts or lumens. It doesn't collect in a small pile in the corner or slip out under a crack in the door.