I have been using the work Qi in Words with Friends for ages. I knew placed strategically that I could gather up a nice batch of points, the plus being I did not have to wait for the allusive u to spell my word.
Qi kind of means a part of energy, in Chinese Qi is an active principle forming part of any living thing or energy flow, so sayeth the Wikipedia.
They also make a reference that in Western culture Qi is like the Force in Star Wars. Well that is so darn cool and I honestly cannot wait to share my new-found information with my son gets home.
May the Qi be with you!