human sounds

1.   to hum

to make a continuous, low sound

2.   to murmur

to make a low, continuous background sound

3.   to burble

to make a continous, murmuring sound

4.   to burble

(of a baby) to make a contented, pleasant sound

5.   to babble

to talk rapidly and continuously in a foolish, excited, or incomprehensible way

They babbled on about their holiday.

6.   to chatter

to talk informally about unimportant matters

She was chattering about her holidays.

7.   to yack

talk at length about trivial or boring subjects

8.   to balb

reveal secrets by indiscreet talk (informal)

9.   to whisper

speak very softly using one's breath rather than one's throat, especially for the sake of secrecy

10. to lisp

to make a speech defect in which s is pronounced like th in thick and z is pronounced like th in this

11. to giggle

laugh lightly and repeatedly in a silly way, from amusement, nervousness, or embarrassment

12. to squeal

to make a long, high-pitched cry or noise

13. to shriek

utter a high-pitched piercing sound or words, especially as an expression of terror, pain, or excitement

14. to whoop

to make a loud cry of joy or excitement

15. to sneer

smile or speak in a contemptuous or mocking manner

16. to bawl

weep or cry noisily

17. to whimper

make a series of low, feeble sounds expressive of fear, pain, or unhappiness

18. to snicker

to give a smothered or half-suppressed laugh; snigger

19. to chuckle

laugh quietly or inwardly

20. to titter

to give a short, half-suppressed laugh; giggle