Yes, ax is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
ax
Verb
1. Chop or split with an ax
2. Terminate
Noun
1. An edge tool with a heavy bladed head mounted across a handle
Verb
1. Chop or split with an ax
2. Terminate
Noun
1. An edge tool with a heavy bladed head mounted across a handle