Shopping is a form of Shop. Shopping is related to Customer. Customer is the opposite of Merchant. 
Black is related to Darkness. Darkness is related to Like. Like is related to Sign. Sign is related to Hazard. 
Shop <--FormOf-- Shopping <--RelatedTo--> Customer <--Antonym--> Merchant 
Black <--RelatedTo--> Darkness <--RelatedTo--> Like <--RelatedTo--> Sign <--RelatedTo--> Hazard 