| Hauptschlüssel | master key |
| Hausschlüssel | housekey |
| Haustürschlüssel | front door key front-door key |
| Altschlüssel | alto clef |
| Autoschlüssel | car key |
| Maulschlüssel | open end spanner |
| Hauptschule | finished elementary school junior high school secondary modern school secondary school |
| Salatschüssel | salad bowl |
| Zweitschlüssel | spare key |
| Bassschlüssel | F clef |
| Baßschlüssel | bass |
| Funkschlüssel | fob |
| aufschlüsseln | itemize |
| Gabelschlüssel | open end spanner |
| Türschlüssel | door key |
| Zündschlüssel | ignition key |
| Hauptachse | major axis |
| Hauptschlagader | aorta |
| Hautschuppe | dander |
| Hauptschnur | reef |