Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old English -oþ
← Proto-Germanic *-ōþuz (inherited)

→ Old English -ing (link)
→ Old English drugaþ (affix)
→ Old English langoþ (affix)
→ Old English seoloþ (suffix)