Here are some nuances:
* ಅಕ್ಕ (akka) is used for an older sister.
* ತಂಗಿ (tanggi) is used for a younger sister.
* ಸಹೋದರಿ (sahodari) is a more formal word for sister, often used in written contexts.
It's also important to consider the context when choosing a word for "sister" in Kannada. For example, if you are talking to your sister directly, you would use ಅಕ್ಕ (akka) or ತಂಗಿ (tanggi) depending on your age relative to her. If you are talking about your sister to someone else, you might use ಸಹೋದರಿ (sahodari).