- IPA(key): /ˈoːpa/ (standard)
- IPA(key): /ˈɔpa/ (chiefly western German)
- IPA(key): /ˈoːpʰɐ/ (some speakers from Kiel)
- Homophone: Oper (some speakers from Kiel)
- The word is commonly used with a definite article in most parts of central Germany, southern Germany, and Austria: Wo ist der Opa? – "Where is Grandpa?" In northern Germany—and generally in writing—no article tends to be used: Wo ist Opa?
Declension of Opa