χαλκός/chalkos

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

This word can mean copper. Copper is a metal.
This word can mean bronze. Bronze is a metal made from copper and tin.
This word can mean brass. Brass is a metal made from copper and zinc.
This word can be used to talk about a gong that is made out of this metal. A gong is a musical instrument that people hit to make a loud noise.
This word can be used to talk about coins that are made out of this metal.