Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Finnish opastaa
← Finnish opas (suffix)
← Finnish taa (suffix)

→ Finnish johtaa (link)
→ Finnish opastin (suffix)
→ Finnish opastus (affix)
→ Finnish opaste (suffix)
→ Finnish opastaja (suffix)
→ Finnish opastella (suffix)
→ Finnish opastaminen (affix)