Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
gumi
←
Proto-Germanic
*gumô
(derived)
←
Proto-Indo-European
*dʰǵʰm̥mō
(derived)
←
Old Norse
gumi
(derived)
→
English
groom
(cognate)
→
Old English
guma
(cognate)
→
Icelandic
brúðgumi
(compound)