Yes, gibbers is a Scrabble word!
...and is worth 12 points in Scrabble, and 15 points in Words with Friends
gibbers
Verb
1. Speak (about unimportant matters) rapidly and incessantly
2. Chatter inarticulately; of monkeys
Noun
1. Unintelligible talking
What Scrabble words can I make with the letters in gibbers?
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Words that can be created with an extra letter added to gibbers:
L:gribbles