Yes, gamp is a Scrabble word!
...and is worth 9 points in Scrabble, and 12 points in Words with Friends
gamp
Noun
1. Colloquial terms for an umbrella
What Scrabble words can I make with the letters in gamp?
3 Letter Words
2 Letter Words
Noun
1. Colloquial terms for an umbrella
3 Letter Words
2 Letter Words