Docbook is an XML-based markup language, primarily used for creating technical documentation. While Docbook is a well-known term in the tech industry, it's always good to have synonyms up your sleeve to avoid repetition. Some of the synonyms for Docbook are "technical writing," "document authoring," "markup language," and "documentation format." Additionally, other terms that closely relate to Docbook include "DITA," "XML," "HTML," and "Markdown." Using synonyms not only makes your writing more diverse and engaging but also helps your content rank higher in search engines. So, whether you're writing a technical report or a blog post, make sure to sprinkle your content with a few Docbook synonyms to make it more appealing and SEO-friendly.