Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
vatna
←
Proto-Germanic
*watnōną
(inherited)
←
Icelandic
vatn
(affix)
←
Icelandic
-a
(affix)
←
Old Norse
vatna
(inherited)
→
English
water
(cognate)
→
Scots
watter
(cognate)