Yes, vigil is a Scrabble word!
...and is worth 9 points in Scrabble, and 12 points in Words with Friends
vigil
Noun
1. A period of sleeplessness
2. The rite of staying awake for devotional purposes (especially on the eve of a religious festival)
3. A purposeful surveillance to guard or observe
What Scrabble words can I make with the letters in vigil?
3 Letter Words
2 Letter Words