| Alptraum | nightmare |
| alptraumhaft | nightmarish |
| Albtraum | nightmare bad dream |
| alptraumartig | nightmarish |
| Haftraum | cell |
| Tagtraum | daydream |
| Klartraum | lucid dream |
| Luftraum | airspace |
| Traum | dream |
| Wachtraum | daydream |
| Weltraum | space |
| Zeitraum | period space |
| Abraum | spoil |
| Hallraum | echo chamber |
| Altarraum | chancel presbytery |
| Apogäum | apogee |
| Alpaka | alpaca |
| Alpha | alpha |
| Abtrag | abrasion |
| Adstrat | adstratum |