I used a couple of different tools to build this, but the core one was a cool little Node library named random-word-slugs. It's a powerful random word library that can get pretty specific in terms of focusing on a particular type of word.
For my first version, I opened up Google AI Studio, started a new prompt, and used these system instructions: You are a text parser. Given a prompt with variables wrapped in {{ and }}, you will replace that with a value based on the contents of the text inside the brackets.
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