Yes, kith is a Scrabble word!
...and is worth 11 points in Scrabble, and 10 points in Words with Friends
kith
Noun
1. Your friends and acquaintances
What Scrabble words can I make with the letters in kith?
3 Letter Words
2 Letter Words
Noun
1. Your friends and acquaintances
3 Letter Words
2 Letter Words