Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Saterland Frisian
Jeest
←
Proto-West Germanic
*gaist
(inherited)
←
Old Frisian
jēst
(inherited)
←
Saterland Frisian
Gäist
(doublet)
→
Saterland Frisian
Gäist
(doublet)