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.
Differences between American and British English: theater
In both the U.S. and the U.K., a theater is a place where people watch plays or other performances. In the U.S., you can also use this word or the word movie theater to mean a place that shows movies. In the U.K., movies are shown in cinemas.