Yes, mock is a Scrabble word!
...and is worth 12 points in Scrabble, and 14 points in Words with Friends
mock
Verb
1. Treat with contempt
2. Imitate with mockery and derision
Adjective
1. Constituting a copy or imitation of something
Noun
1. The act of mocking or ridiculing
What Scrabble words can I make with the letters in mock?
3 Letter Words
2 Letter Words