This is another creativity exercise. The group is given a letter such as 'S' and they are asked to write down as many words, which begin with that letter, as they can think of in five minutes. Names and place names are allowed.
Uses for... (another creativity exercise)
A variation is to give the group a pair of letters such as 'ik' and challenge them to write down words which contain the pair, e.g. 'strike'.