1) Rustle 2) Susurration 1) Sound 2) Susurration 3) Whisper 
murmuring; whisper; rustling
• (n.) The act of whispering; a whisper; a murmur.
Synonym for murmur ... A finding on physical examination of the heart that can, in some cases, indicate the presence of cardiac disease. Murmurs result from vibrations set up in the bloodstream and the surrounding heart and great vessels as the result of turbulent flow. ... (27 Sep 1997) ... 
Su·sur'rus noun [ Latin ] The act of whispering; a whisper; a murmur. De Quincey. « The soft susurrus and sighs of the branches.» Longfellow. 
Type: Term Pronunciation: sŭ-sŭr′ŭs Synonyms: murmur1
a soft murmuring or rustling sound; whisper.