| Archaikum | Archaean |
| Archaismus | archaism |
| archaisch | archaic obsolet |
| Arcadius | Arcadius |
| Archaeen | archaeon |
| Archaeon | archaeon |
| Archipel | archipelago |
| Archiv | archive |
| Archivar | archivist |
| Dichasium | dichasium |
| Abschaum | dregs scum |
| Achaia | Achaea |
| Achau | Achau |
| Schaum | foam froth lather spume |
| Bahaitum | Bahá'í Faith |
| Haiku | haiku |
| Hadaikum | Hadean |
| Azoikum | Archaean Archean Azoic |
| Narkotikum | anaesthetic anesthetic |
| Praktikum | internship practical training practicum work experience |