THESAURUS
sibilate
assibilate, bark, bawl, bellow, blare, blat, blubber, boom, bray, breathe, buzz, cackle, chant, chirp, coo, crow, drawl, effervesce, exclaim, fizz, fizzle, flute, gasp, growl, grunt, hiss, hush, keen, lilt, lisp, mumble, murmur, mutter, pant, pipe, roar, rumble, scream, screech, shriek, shush, sigh, sing, siss, sizz, sizzle, snap, snarl, sneeze, sniff, sniffle, snore, snort, snuff, snuffle, sob, spit, splutter, sputter, squall, squash, squawk, squeal, squelch, squish, swish, thunder, trumpet, twang, wail, warble, wheeze, whine, whish, whisk, whisper, whistle, whiz, whoosh, yap, yawp, yell, yelp, zip