Hesitate

Whisper

Hiss

Mumble

Mutter

Hum

Grunt

Stammer

Stutter

Quaver

Lisp

Babble = Gabble = Gibber = Jabber

Ramble

Slur

Chat

Chatter

Gossip

Call

Shout

Whoop

Cry (out)

Yell

Scream

Shriek: scream.
The men shrieked with laughter.

Bellow

Squeak

Squeal

Whine

Chirp

Cheer

Croak

Blurt out

Snap

Splutter

Bark (out)