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: gas
In the U.S., gas often refers to a type of liquid fuel that is used to produce power in cars: We'd better get gas on our way out of town.. The usual British word for this is petrol. Gas can also refer to a substance like air that is burned to cook food or to heat your house, and it can be used with this meaning in both the U.S. and the U.K.: a gas furnace.