Cocaine is related to Blow. Blow is the opposite of Breathing. Breathing is related to Throat. Throat is related to Organ. 
Half is related to Value. Value is the opposite of Cheap. 
Cocaine <--RelatedTo--> Blow <--Antonym--> Breathing <--RelatedTo--> Throat <--RelatedTo--> Organ 
Half <--RelatedTo--> Value <--Antonym--> Cheap 