In Korea, the word for an older sister depends on the gender of the person speaking and the age difference between the siblings. Let’s explore some of the most common words used to refer to an older sister in Korean.

- Eonni (언니)
Eonni is the most common and widely used word for an older sister in Korean. It is used by younger siblings, both male and female, to refer to their older sisters. The word is often used affectionately and can also be used to address older female friends.
- Nuna (누나)
Nuna is the Korean word for an older sister used by a male sibling. This word is used to show respect to an older sister, especially if there is a significant age gap between the siblings. It can also be used as a term of endearment.
- Onni (온니)
Onni is a variation of the word eonni, which is often used by younger children who have not yet learned to pronounce the letter “ㅇ” correctly. It is commonly used in informal settings or by younger siblings who are close in age to their older sister.
- Eonniya (언니야)
Eonniya is a more affectionate version of eonni and is often used by younger siblings to get their older sister’s attention. It is similar to adding “hey” or “hey, sis” in English.
- Eonbae (언배)
Eonbae is a slang term used by younger people to refer to their older sisters. It is a combination of the words “eonni” and “bae,” which means older sister in Chinese. The word is often used by younger people who are trying to sound cool or trendy.
- Noona (누나)
Noona is a variation of the word nuna, which is also used by male siblings to refer to their older sisters. However, this word is more commonly used by Korean men who are close in age to their older sisters. It can also be used as a term of endearment.
- Unni (언니)
Unni is a variation of the word eonni, which is often used by younger children who have not yet learned to pronounce the letter “ㅇ” correctly. It is commonly used in informal settings or by younger siblings who are close in age to their older sister.
In addition to these words, there are also other words used to refer to an older sister in Korean, such as “eoni,” “eonbae,” and “sunbaenim.” However, these words are less commonly used than the ones mentioned above.
In conclusion, the word for an older sister in Korean depends on the gender of the person speaking and the age difference between the siblings. The most common words used to refer to an older sister in Korean are eonni, nuna, and noona. However, there are also other words that can be used depending on the situation and relationship between the siblings.