| Kugelhaufenreaktor | pebble-bed reactor |
| Kernreaktor | nuclear reactor |
| Kugelausstecher | melon baller |
| Kugelhantel | kettlebell |
| Lügendetektor | lie detector |
| Gegenreaktion | counterreaction |
| Kettenreaktion | chain reaction |
| Druckwasserreaktor | pressurized water reactor |
| Forschungsreaktor | research reactor |
| Kernfusionsreaktor | nuclear fusion reactor |
| Schwerwasserreaktor | heavy water reactor |
| Siedewasserreaktor | boiling water reactor |
| Gebäudetrakt | wing |
| Kugelgelenk | ball-and-socket joint ball and socket joint |
| Kugelzieher | wad hook |
| Kugelhagel | hail of bullets |
| Kugellager | ball bearing ball-bearing bearing |
| Kugelschreiber | ballpoint pen |
| Flügelfenster | casement window |
| Geläufigkeit | fluency |