A word cloud is an attractive way of visualising a large chunk of text in a more pleasing way. It shows the most frequent words used throughout the text. It’s a good way of seeing which words are used the most in any piece of writing. Here are just a few ideas on how you could use Word clouds in the classroom.
http://www.whiteboardblog.co.uk/2011/09/8-word-cloud-makers-for-teachers/