Bread is the opposite of Butter. Butter is a type of Grocery. Grocery is related to Market. you are likely to find Bag in/at/on Market. 
Dirty is a synonym of Soil. you are likely to find Potato in/at/on Soil. 
Bread <--Antonym--> Butter --IsA--> Grocery <--RelatedTo--> Market <--AtLocation-- Bag 
Dirty <--Synonym--> Soil <--AtLocation-- Potato 