Red words in the dictionary often come with extra details, such as collocation boxes (showing how words pair together) and metaphor boxes (explaining common idiomatic uses).
Macmillan Dictionary Red Words & Stars Pack - Onestopenglish macmillan dictionary 7500 words list
These are the top 2,500 most frequent words in English. Mastering these allows a learner to understand roughly 80% of any standard text. Red words in the dictionary often come with