Enforcement is related to Law. Law is related to Legislature. Legislature is etymologically related to Legislator. 
Stock is related to Soup. Soup is related to Hot. Hot is the opposite of Cold. 
Enforcement <--RelatedTo--> Law <--RelatedTo--> Legislature --EtymologicallyRelatedTo--> Legislator 
Stock <--RelatedTo--> Soup <--RelatedTo--> Hot <--Antonym--> Cold 