Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
sennight
←
English
sevennight
(doublet)
←
Middle English
senight
(inherited)
←
Middle English
sinight
(mention)
←
Middle English
sevenight
(derived)
←
Middle English
sevennyght
(mention)
→
English
fortnight
(mention)
→
English
sevennight
(doublet)