Susurrus [ Susurrous] – a lovely word which sounds just like what it is!
Pronounced [soo-sur-uh s]
Whispering or rustling sounds
Late Middle English: from late Latin susurratio(n-), from Latin susurrare ‘to murmur, hum’, from susurrus ‘whisper’.
On either hand, cliffs rose up, and the susurrus of waves breaking on sand could be heard in the distance. – Robert F Young
Walking through the forest was a peaceful meditation with only the susurrus of the leaves of the giant oaks gently playing in the wind.
More examples from the web: