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What are red words?

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 morefrequent, and three-star words are the most frequent.

British English pronunciation: colorless /ˈkʌlə(r)ləs/
the American spelling of colourless

This is the British English definition of colorless. View American English definition of colorless