| kalte Fusion | cold fusion |
| Bankenfusion | bank merger |
| Kernfusion | nuclear fusion |
| Konfusion | bewilderment |
| Allusion | allusion |
| Kollusion | collusion |
| Kalifin | caliph |
| Kaltakquise | cold call |
| Kaltumformen | cold forming |
| kaltblütig | cold-blooded |
| kalter Krieg | cold war |
| Kalter Krieg | Cold War |
| skalare Funktion | scalar function |
| Kaleidoskop | kaleidoscope |
| Kalkulation | calculation costing |
| Kaltfront | cold front |
| kaltlassen | leave someone cold |
| Falterfisch | butterflyfish |
| alte Frau | old woman |
| alte Kiste | jalopy |