THESAURUS
coo
aspirate, bark, bawl, bellow, blare, blat, blubber, boom, bray, breathe, buzz, cackle, call, carol, caw, chant, chatter, cheep, chirk, chirp, chirr, chirrup, chitter, chuck, clack, cluck, cock-a-doodle-doo, croak, cronk, crow, cuckoo, drawl, drum, exclaim, flute, gabble, gaggle, gasp, gobble, growl, grunt, guggle, hiss, honk, hoo, hoot, keen, lilt, maffle, mumble, murmur, mussitate, mutter, pant, peep, pip, pipe, quack, roar, roll, rumble, scold, scream, screech, shriek, sibilate, sigh, sing, snap, snarl, snort, sob, squall, squawk, squeal, susurrate, thunder, trill, trumpet, twang, tweet, twit, twitter, wail, warble, whine, whisper, whistle, yap, yawp, yell, yelp
ROGET THESAURUS
coo
Ululation
VB
cry, roar, bellow, blare, rebellow, growl, snarl, bark, bow-wow, yelp, bay, bay at the moon, yap, yip, yipe, growl, yarr, yawl, snarl, howl, grunt, gruntle, snort, squeak neigh, whinny, bray, mew, mewl, meow, purr, caterwaul, pule, baa, bleat, low, moo, troat, croak, peep,
coo, gobble, quack, honk, gaggle, guggle, crow, caw, squawk, screech cackle, cluck, clack, chuck, chuckle, hoot, hoo, chirp, cheep, chirrup, twitter, cuckoo, warble, trill, tweet, pipe, whistle, hum, buzz, hiss, blatter, ratatat.