εἶδος/eidos

This word is a type of thing. It is a noun.

This word can mean appearance or form. When this word is used in this way, it is used to talk about how someone or something looks.
This word can mean sight. When this word is used in this way, it is used to talk about the ability to see.
This word can mean a kind. When this word is used in this way, it is used to talk about a group of things that are similar in some way.