Yes, gees is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
gees
Verb
1. Turn to the right side
2. Give a command to a horse to turn to the right side
Noun
1. A unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated
What Scrabble words can I make with the letters in gees?
3 Letter Words
2 Letter Words