* Ate (pronounced ah-tay) - This is the most common and informal way to refer to an older sister.
* Kapatid na babae (pronounced ka-pa-tid nah ba-ba-eh) - This is the more formal and literal translation of "older sister".
It's important to consider the context and your relationship with the person you're talking about when choosing which term to use. "Ate" is usually used when speaking to your own older sister, or to someone else's older sister if you are close to her. "Kapatid na babae" is more appropriate in formal settings or when talking about someone you don't know well.