Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Galician caer
Spanish caer (cognate)
Proto-Indo-European *ḱh₂d- (derived)
Proto-Italic *kadō (inherited)
Latin cadere (inherited)
Latin cadō (mention)
Portuguese cair (cognate)
Old Portuguese caer (inherited)

Galician cadoiro (suffix)
Galician acaer (prefix)
Galician caer ben (link)
Portuguese cair (cognate)