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@dotproto What you’re looking for is called inflectors in the field of natural language processing. The go-to library is called natural, here’s the documentation on its inflectors: naturalnode.github.io/natural/inflectors.html. It’s best run on a server, but works on the client, too: naturalnode.github.io/natural/development.html#using-the-library-in-a-browser. 🤓