Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
gædere
←
Proto-Germanic
*gadar
(inherited)
←
Proto-Germanic
*gad-
(derived)
→
Old English
togædere
(affix)
→
Old English
ætgædere
(affix)