Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
mer-
←
Old English
mere-
(inherited)
←
English
mere
(link)
←
English
mercow
(mention)
←
English
mermaid
(mention)
←
English
merman
(mention)
←
English
mereswine
(mention)
←
English
mersnake
(mention)
←
English
merman
(mention)
←
English
mermaid
(mention)
←
English
merlady
(mention)
←
English
merfolk
(mention)
←
English
merwife
(mention)
←
English
mermonster
(mention)
←
Middle English
mere-
(inherited)
←
Proto-Germanic
*mari-
(inherited)
←
Proto-Germanic
*mari
(derived)
←
Proto-Indo-European
*mer- (sea)
(root)
→
English
merman
(affix)
→
English
mersalyl
(affix)