| Regelkreis | closed loop control loop |
| Regeltreue | compliance |
| Feenkreis | fairy circle fairy ring |
| Regalbrett | ledge |
| regellos | licentious |
| Regelwerk | legal framework |
| Regenzeit | wet season rainy season |
| Regress | regress |
| regelrecht | downright proper real actual |
| regenreich | rainy |
| Wegekreuz | shrine |
| bügelfrei | non-iron |
| vogelfrei | outlawed |
| Wahlkreis | constituency electoral district electorate riding ward |
| Breitenkreis | latitude |
| Längenkreis | line |
| Senkreis | cutting |
| Teufelskreis | vicious circle |
| Tierkreis | zodiac |
| Wendekreis | tropic turning circle |