It's important to note that this word can refer to both a biological sister and a female friend or relative. To be more specific, you can use:
* "ɔbaa yɛn": This means "sister" in the sense of a biological sister.
* "ɔbaa nti": This means "sister" in the sense of a female friend or relative.
For example, you can say:
* "Me ɔbaa yɛn yɛ ɔyere": My sister is married.
* "Me ɔbaa nti yɛ wɔ hɔ": My sister is here.