| Regelbuch | rulebook |
| Segeltuch | canvas duck sailcloth |
| Regelung | closed-loop control regulation arrangement |
| regelbar | adjustable |
| regelrecht | downright proper real actual |
| Hegelsch | Hegelian |
| Spielbuch | gamebook |
| Sudelbuch | wastebook |
| Gebetbuch | prayer book |
| Lesebuch | primer reader reading book storybook |
| Nebenbuch | subledger |
| Tagebuch | diary log journal |
| Fregesch | Fregean |
| Regeln | control |
| regeln | control manage regulate |
| Regolith | regolith |
| Regulus | Regulus |
| regellos | licentious |
| Regel | rule regulation period |
| Regelwerk | legal framework |