Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Dutch
om-
←
Dutch
om
(mention)
→
English
um-
(cognate)
→
Luxembourgish
ëm-
(cognate)
→
Dutch
omvatten
(affix)
→
Dutch
omstreden
(prefix)
→
Dutch
omschrijven
(affix)
→
Dutch
ommuren
(confix)
→
Dutch
omsingelen
(affix)
→
Dutch
omhullen
(affix)
→
Dutch
omwallen
(confix)
→
Dutch
omdijken
(affix)