Oven can be used for Cooking. you are likely to find Food in/at/on Oven. 
Pair is a type of Occur. Pair is related to Couple. Couple is a synonym of Mate. Mate is related to Spouse. 
Cooking <--UsedFor-- Oven <--AtLocation-- Food 
Occur <--IsA-- Pair <--RelatedTo--> Couple <--Synonym--> Mate <--RelatedTo--> Spouse 