Currently, the reveal word is confusing to have enabled after revealing a word as it is no use to reveal the word by the relevant action once it is revealed. This is a confusion in the UI workflow and there has been an old bugreport about this one for a while. It would be nice to fix this once and all.

Further information: http://community.kde.org/GoogleCodeIn/2012/Ideas#KDE_Edu_.28Kanagram.29:_Avoid_the_confusion_after_revealing_a_word