Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Gumm
←
German
Gaumen
(cognate)
←
English
gum
(cognate)
←
Proto-Germanic
*gōmô
(inherited)
←
Proto-Germanic
*gaumô
(cognate)
←
Old High German
guomo
(inherited)
←
Old High German
goumo
(cognate)
←
Icelandic
gómur
(cognate)