* Amiga: This is the most common word for a female friend, and it's used for close friends.
* Compañera: This word is used for a female friend who is a companion, someone you spend time with.
* Colega: This word is more formal and is used for a female coworker or someone you know through work or a shared activity.
* Conocida: This word is used for a female acquaintance, someone you know but are not close with.
The best word to use will depend on the specific context.