Animal is related to Vegetable. Vegetable is the opposite of Meat. 
Rain is related to Event. Event is related to Program. Program is related to Soap. Soap is related to Small. 
Animal <--RelatedTo--> Vegetable <--Antonym--> Meat 
Rain <--RelatedTo--> Event <--RelatedTo--> Program <--RelatedTo--> Soap <--RelatedTo--> Small 