90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
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The Ivy League universities are Brown, Columbia, Cornell, Dartmouth, Harvard, Princeton, the University of Pennsylvania, and Yale. They have an excellent educational reputation and high social status (similar to Oxford and Cambridge universities in Britain), and provide the U.S. with many of its leaders in business and public life. The phrase "Ivy League" comes from the idea that the buildings of these universities are covered in ivy, because they are so old.