Susurrus

Not only a word I had never come across before but a seductive one as well. Three s's, three u's and two r's.

susurrus
Main Entry: su.sur.rus
Pronunciation: su-'s&r-&s, -'s&-r&s
Function: noun
Etymology: Latin, hum, whisper -- more at SWARM
- su.sur.rant /-'s&r-&nt, -s&-r&nt/ adjective