| Geheimsprache | secret language |
| Gemeinsprache | colloquialism standard language |
| Geheimbericht | secret report |
| Geheimfach | secret compartment |
| Interimsprache | interlanguage |
| Zweitsprache | second language, L 2 |
| Geheimzahl | PIN |
| Geheimzeichen | secret sign |
| Einheitssprache | standard language |
| Interimssprache | interlanguage |
| Khmer-Sprache | Khmer |
| Kri-Sprache | Cree |
| Metasprache | metalanguage |
| Objektsprache | object language |
| Weltsprache | world language |
| Altaisprache | Altaic language |
| Ammensprache | baby-talk caretaker speech mother's speech motherese nursery language parental speech |
| Arbeitssprache | working language |
| Berbersprache | Berber language |
| Bühnensprache | standard pronunciation |