Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Indo-European *ser- (guard)

→ English deserve (root)
→ English service (root)
→ English hero (root)
→ English serf (root)
→ English observe (root)
→ English servile (root)
→ English preserve (root)
→ English reserve (root)
→ English serve (root)
→ English heroine (root)
→ English servitude (root)
→ English conserve (root)
→ English subservient (root)