Yes, fining is a Scrabble word!
...and is worth 10 points in Scrabble, and 13 points in Words with Friends
fining
Verb
1. Issue a ticket or a fine to as a penalty
2. Equip (a car) with fins
3. Propel oneself through the water in a finning motion
4. Show the fins above the water while swimming
What Scrabble words can I make with the letters in fining?
3 Letter Words
2 Letter Words