Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
German
Fünfzehneck
←
German
fünfzehn
(compound)
←
German
Ecke
(compound)
→
German
fünfzehneckig
(suffix)