Rubrics

6 clues
Protocols
Red headings
Book headings
Modes of conduct
Rules often in red
Manuscript headings
Similar answers:
Africasiargentinaruba
Afterrubbersoul
Agarics
Alcoholrub
Allenrubber
Alphanumerics
Arturrubinstein
Arub
Aruba
Arubabattery
Arubagoldberg
Aruban
Arubans
Arubewithaview
Auburnrubber
Aytheresthegrub
Aytherestherub
Aytherestherubble
Aytherestherube
Aytherestheruby