Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Luxembourgish gro
German grau (cognate)
English grey (cognate)
Proto-Germanic *grēwaz (derived)
Old High German grāo (derived)
Icelandic grár (cognate)
Dutch grijs (cognate)

Luxembourgish Gromees (compound)