Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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German er-
← Proto-West Germanic *uʀ- (derived)
← Old High German ir- (derived)

→ English a- (cognate)
→ English aghast (cognate)
→ English alight (cognate)
→ English alighten (cognate)
→ Old English a- (cognate)
→ Danish erkende (affix)
→ German erweisen (affix)
→ German erröten (affix)
→ German erweitern (affix)
→ German erpressen (affix)
→ German ernennen (affix)
→ German erhöhen (affix)
→ German zer- (mention)
→ German erstehen (mention)
→ German ermorden (affix)
→ German erkälten (affix)
→ German ertränken (affix)
→ German erachten (affix)
→ German ermächtigen (compound)
→ German Wiederauferstehung (affix)
→ German erdenken (affix)
→ German erfragen (affix)
→ German erbauen (affix)
→ German erhaschen (affix)
→ German erdulden (affix)
→ German erträumen (affix)
→ German erdreisten (affix)
→ German erweichen (affix)
→ German erbieten (affix)
→ German ertüchtigen (affix)
→ German erquicken (affix)
→ German ermannen (affix)
→ German erbeuten (affix)
→ German erschlaffen (affix)
→ German ertauben (affix)
→ German erbittern (affix)
→ Middle Low German vor- (cognate)
→ Gothic 𐌿𐍃 (cognate)
→ Luxembourgish erfrëschen (affix)
→ Dutch ver- (mention)
→ Old Saxon a- (cognate)
→ Albanian shpresë (mention)
→ Swedish er- (derived)
→ Vilamovian dyr- (cognate)