Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
German
härten
←
German
hart
(mention)
→
German
aushärten
(prefix)
→
German
erhärten
(prefix)
→
Esperanto
hardi
(derived)
→
Old French
hardir
(cognate)
→
Luxembourgish
häerden
(cognate)