ἑαυτοῦ/heautoū

This word is used when a subject does and receives an action. It is a reflexive pronoun.

This word can mean himself, herself, or itself.
This word can mean themselves, ourselves, or yourselves.
This word can mean each other or one another. This word is used in this way to talk about people doing something for each other or with one another.
This word can mean his, her, or their. This word is used in this way to talk about something that belongs to the person or people who are doing something or were mentioned in the sentence.