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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In the US, prom night is especially important to seniors (=students in their last year of high school). They buy expensive prom dresses or rent tuxedos (=formal men’s suits), give corsages (=flowers you wear on your dress or jacket) to their dates (=person you ask to go with you to the dance), and sometimes ride to the prom in a rented limo (=very long, expensive car).