Procedures and macros are documented in their own sections: see Procedures and Macros.
Variable objects are documented as part of the description of Guile’s module system: see Variables.
Asyncs, dynamic roots and fluids are described in the section on scheduling: see Scheduling.
Hooks are documented in the section on general utility functions: see Hooks.
Ports are described in the section on I/O: see Input and Output.
Regular expressions are described in their own section: see Regular Expressions.