Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
German
wat
←
German
was
(doublet)
←
Middle High German
wat
(derived)
←
Middle Low German
wat
(derived)
←
Central Franconian
wat
(borrowed)
←
Old High German
hwat
(derived)
←
German Low German
wat
(borrowed)
←
Old Saxon
hwat
(derived)
→
German
was
(doublet)
→
German
wa
(mention)