Refrigerator is related to Food. Candy is a type of Food. Kiss is a type of Candy. 
Fate is related to Chance. Chance is related to Possible. Possible is the opposite of Certain. 
Refrigerator <--RelatedTo--> Food <--IsA-- Candy <--IsA-- Kiss 
Fate <--RelatedTo--> Chance <--RelatedTo--> Possible <--Antonym--> Certain 