My Bookshelf
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I only recommend books I have actually read. Some links below are affiliate links (Amazon & Bookshop), meaning I earn a small commission if you buy through them. This supports my writing at no cost to you.
The Well-Spoken Thesaurus
Tom Heehler
Unlike a traditional thesaurus that simply lists synonyms for single words (e.g., happy -> joyful), this book is designed as a style guide for eloquence. Its primary goal is to help you translate "average" or "plain" speech into language that is more persuasive, authoritative, and sophisticated.