Cast is a type of Copy. Copy is a synonym of Image. Image is a synonym of Counterpart. 
Ghost is related to Invisible. Invisible is related to Glass. Glass is the opposite of Metal. 
Cast --IsA--> Copy <--Synonym--> Image <--Synonym--> Counterpart 
Ghost <--RelatedTo--> Invisible <--RelatedTo--> Glass <--Antonym--> Metal 