Yes, gibe is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
gibe
Verb
1. Be compatible, similar or consistent; coincide in their characteristics
2. Laugh at with contempt and derision
Noun
1. An aggressive remark directed at a person like a missile and intended to have a telling effect
What Scrabble words can I make with the letters in gibe?
3 Letter Words
2 Letter Words