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.
From the name of a character like this in Charles Dickens's story A Christmas Carol. Ebenezer Scrooge is a mean old man who hates Christmas, but after he sees a series of ghosts his character changes and he becomes a nicer, more generous person.