Gold is related to Valuable. Valuable is the opposite of Cheap. Cheap is a different concept from Expensive. Expensive is related to Coast. 
Bush is etymologically related to Box. Bush is a type of Wilderness. Wilderness is the opposite of Civilization. Civilization is related to Developing. 
Gold <--RelatedTo--> Valuable <--Antonym--> Cheap <--DistinctFrom--> Expensive <--RelatedTo--> Coast 
Box <--EtymologicallyRelatedTo-- Bush --IsA--> Wilderness <--Antonym--> Civilization <--RelatedTo--> Developing 