assibilate assibilation buzz effervesce effervescence effervescing fizz fizzle fizzling frication frictional rustling hiss hissing hush hushing lisp rhonchus shush shushing sibilance sibilate sibilation siffle sigmatism siss sissing sizz sizzle sizzling sneeze sneezing sniff sniffle snore snort snuff snuffle spit splutter sputter squash squelch squish sternutation stertor swish wheeze whish whisper whistle whistling white noise whiz zip