THESAURUS
susurration
aspiration, bated breath, breath, breathy voice, drone, droning, exhalation, gabble, gibber, gibbering, jabber, jibber, little voice, low voice, maundering, mouthing, mumble, mumbling, murmur, murmuration, murmuring, mutter, muttering, rumor, sigh, soft voice, stage whisper, still small voice, susurrus, underbreath, undertone, whisper, whispering
ROGET THESAURUS
susurration
Faintness
N
faintness, faint sound, whisper, breath, undertone, underbreath, murmur, hum,
susurration, tinkle, still small voice, hoarseness, raucity, inaudible, scarcely audible, just audible, low, dull, stifled, muffled, hoarse, husky, gentle, soft, faint, floating, purling, flowing, whispered, liquid, soothing, dulcet, susurrant, susurrous, in a whisper, with bated breath, sotto voce, between the teeth, aside, piano, pianissimo, d la sourdine, out of earshot inaudibly, (ii) SPECIFIC SOUNDS.