Moby Thesaurus List

Before there were AI writing assistants, there was this: a sprawling, magnificent aberration in the world of reference works. Grady Ward's Moby Thesaurus List compiles over 30,000 root words with an almost obsessive 2.5 million synonyms and related terms, all released into the public domain for anyone to use, modify, or feed into their own projects. It's not a book you'll read cover to cover. It's something more powerful: a tool that writers and programmers have weaponized for decades, parsing its ASCII simplicity into better prose, smarter search engines, and more expressive chatbots. Beyond the main collection, Ward included a smaller Roget-based thesaurus, offering a more structured alternative for those who prefer their synonyms organized. Whether you're a novelist hunting for exactly the right word, a developer building natural language tools, or simply someone who finds joy in the sheer abundance of English, this thesaurus remains an indispensable bedrock resource. It is vocabulary as infrastructure, freely given to the world.