I've been reluctant to ask this question as there many lists like this all over the net. However, another question I had about cavies made that there isn't a good list of all synonyms and what information is availalbe isn't presented as clearly as one would hope. Therefore, I'm hoping this community can compile a comprehensive list of the onomatopoeias used.
Guinea Pig Onomatopoeias and Their Meanings
Synonyms: wheet. whistle,
Causes: Excitement, anticipation; a call for attention, usually in association food associated sounds, requests for help
Synonyms: Uncertain Beg
Causes: Unclean cage, or a guess that food is near by
Shriek (high pitched wheek)
Causes: Pain, or great fear, or warning to stay away
squeak (shopping cart wheel)
Causes: Contentment, usually accompanied by occasional purring
Synonyms: Sometimes confused with a rumble
Causes: Happyness, Joy
Synonyms: Short Purr
Causes: Noises that frighten the guinea pig, annoyances
Synonyms: Deep Purr, Coo
Causes: Mating call
Synonyms: Chubble, Mutter
Causes: Freedom, exploration, contentment
Synonyms: Moan, Complaining
Causes: A pig is disturbed by another in it's own cage, or dislikes the way a human is touching it.
Causes: Unknown; possibly because a guinea pig was startled, or just because
Synonyms: (teeth) chatter
Causes: Angry, Upset guinea pig with the potential to become hostile
Causes: Anger, agitation; usually accompanies by teeth chattering.