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

→ English slack (inherited)
→ Old English slæc (inherited)
→ Finnish lakka (mention)
→ Finnish lakata (mention)
→ Icelandic slakur (inherited)
→ Old Norse slakr (inherited)