| Doppelkolbenmotor | split single motor |
| Kolbenmotor | piston engine |
| Kreiskolbenmotor | planetary piston engine rotary engine rotary piston engine |
| Doppelganzenote | breve |
| Doppelsöldner | doppelsöldner |
| Doppelagent | double agent |
| Doppelagentin | double agent |
| Doppelangebot | twofer |
| Doppelflinte | double-barrelled shotgun |
| Doppelzentner | quintal |
| Doppeladler | double-headed eagle |
| Doppelbett | double bed full-size bed king-size bed |
| Doppelleben | double life |
| Doppelmörder | double-murderer two-time murderer |
| Doppelweltmeister | two-time world champion |
| Sonnenkollektor | solar thermal collector |
| Drehkondensator | variable capacitor |
| Doppelbock | doppelbock |
| Doppelbödigkeit | ambiguity |
| Doppelcicero | double pica |