S: (n) rustle, rustling, whisper, whispering (a light noise, like the noise of silk clothing or leaves blowing in the wind)
Adjective
S: (adj) murmurous, rustling, soughing, susurrous (characterized by soft sounds) "a murmurous brook"; "a soughing wind in the pines"; "a slow sad susurrous rustle like the wind fingering the pines"- R.P.Warren