Bounce is a type of Refuse. Garbage is a type of Refuse. Garbage is related to Cover. 
Prevention is a synonym of Bar. Bar is related to Gold. Gold is a different concept from Bronze. 
Bounce --IsA--> Refuse <--IsA-- Garbage <--RelatedTo--> Cover 
Prevention <--Synonym--> Bar <--RelatedTo--> Gold <--DistinctFrom--> Bronze 