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If you'd like to expand your vocabulary reading is the best way to do so! Novels, poetry, or even short stories. Reading just once a day can have a huge impact on your rapping skills. You can also crack open the dictionary and just start reading, pick one to three random words and try to incorporate them in your rapping. Also, dictionary.com has a 'word of the day' you can sign up for and they will send you a new word every day, directly to your e-mail, then write a verse with your new word of the day.
Hope this helps