This is something that is really lacking in Rise, as there is no way to separately attach resources like a Glossary. A Glossary needs to be available to a learner at any time, and they should be able to access it from anywhere.
We use Accordion blocks in a Lesson for our Glossary. A Glossary is something that may or may not be used, so using a Lesson to create one is problematic because it potentially affects your course completion if the completion setting is based on the percentage of the course viewed.
If the Glossary is in a Lesson, it also means learners need to leave the Lesson they are currently in in order to view the Glossary, and then navigate back to where they were before.