Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
German iker

→ German Chemiker (suffix)
→ German Theoretiker (suffix)
→ German Allergiker (suffix)
→ German Asthmatiker (suffix)
→ German Diabetiker (suffix)
→ German Aphasiker (suffix)
→ German Bulimiker (suffix)