Yes, gap is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
gap
Verb
1. Make an opening or gap in
Noun
1. A conspicuous disparity or difference as between two figures
2. An open or empty space in or between things
3. A narrow opening
4. A pass between mountain peaks
5. A difference (especially an unfortunate difference) between two opinions or two views or two situations
6. An act of delaying or interrupting the continuity
What Scrabble words can I make with the letters in gap?
2 Letter Words