Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Dutch
geheimenis
←
German
Geheimnis
(cognate)
←
Dutch
geheim
(suffix)
←
Dutch
nis
(suffix)
→
German
Geheimnis
(cognate)