This is a self-help book. If you use it intelligently, you will help yourself to strengthen and expand your word knowledge. The words you will learn, moreover, are essential in that they are known and used regularly by educated people. You will find that such words as squander, rehabilitate, blunder, obesity and five hundred more will turn up in your newspapers, in the magazines you read, in books, on televisions, in the movies and in the conversation of the people you meet daily.