Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Slavic *rъďavъ

→ Belarusian іржавы (inherited)
→ Bulgarian ръждав (inherited)
→ Czech rezavý (inherited)
→ Macedonian ’рѓав (inherited)
→ Polish rdzawy (inherited)
→ Russian ржавый (inherited)
→ Slovak hrdzavý (inherited)
→ Slovene rjav (inherited)