Gold is related to Valuable. Valuable is the opposite of Cheap. Cheap is a different concept from Expensive. Expensive is related to Coast. 
Laughter is derived from Laugh. 
Gold <--RelatedTo--> Valuable <--Antonym--> Cheap <--DistinctFrom--> Expensive <--RelatedTo--> Coast 
Laugh <--DerivedFrom-- Laughter 