Knoword - A vocabulary game

According to Knoword itself it can improve your: vocabulary, speed of thought as well as analytical, observational and typing skills. Anywas I like this game called Knoword and you should try it too! When you start this game, with its clear interface, you will be greeted with just one letter. Underneath this letter will be a dictionary definition of a word, which will begin with the letter in the box. Complete the word and you will gain points and extra time. 
A little warning: it can be addicting.