| Underground | underground |
| Untergrund | bedrock (geol.) subfloor subgrade (constr., tech., geol.) subsoil substrate substratum base basis footing ground base coat (paint etc.) base material surface undercoat (paint etc.) underground |
| Wanderfreund | hiker |
| Hintergrund | background |
| Hundefreund | dog lover |
| Vordergrund | foreground |
| untergehend | setting |
| Bücherfreund | bibliophile |
| Judenfreund | jewlover |
| Undercut | undercut |
| Wunder tun | work wonders |
| Wunderland | wonderland |
| Wundertrank | potion |
| junger Hund | puppy |
| junger Spund | whippersnapper |
| Beweggrund | motive |
| Underdog | underdog |
| Wunderkind | child genius wunderkind |
| unbegründet | unfounded |
| ungesund | unhealthy |