The phrase "most susurrus" refers to something that is very soft and murmuring, like the sound of whispering or rustling leaves. Some synonyms that could be used instead of "most susurrus" include "whispery," "murmuring," "breathy," "rustling," "sibilant," and "hushed." These words all convey a sense of quiet, gentle sound, and can be used to describe things like the wind in the trees, a soft conversation between friends, or the sound of a river flowing by. Whether you're writing poetry, prose, or just trying to find the right word to describe a peaceful moment, these synonyms for "most susurrus" can help capture the soft sounds around us.