Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Catalan regular
Latin rēgulāre (borrowed)
Latin rēgulō (mention)

Catalan regulador (affix)
Catalan regularment (suffix)
Catalan regularitat (affix)
Catalan regulació (suffix)
Catalan regularitzar (affix)