Examples of release sets are “GNOME Infrastructure” or “GNOME 43”. Official GNOME release sets are further divided into categories such as “Desktop Applications” and “Developer Platform”. Look here if you want to compare language support in any of these release sets.
Modules are separate libraries or applications, with one or more branches of development included. They are usually taken from the Git repository, and we keep all relevant information on them (GitLab details, web page, maintainer information…).