Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
twēne
→
North Frisian
tau
(derived)
→
North Frisian
tou
(inherited)
→
North Frisian
twäär
(derived)
→
West Frisian
twa
(inherited)
→
Saterland Frisian
twäin
(inherited)