Human: What are the best books to read if I want to improve my vocabulary? Assistant: 
Thesaurus.com has a great list of books that can help you build your vocabulary. They include classics such as To Kill a Mockingbird by Harper Lee and 1984 by George Orwell, as well as more modern titles like The Catcher in the Rye by J.D. Salinger and Americanah by Chimamanda Ngozi Adichie.