Northern is similar to Federal. Federal is related to Express. 
Popular is related to School. you are likely to find Food in/at/on School. Food is related to Need. Need is the opposite of Sufficient. 
Northern <--SimilarTo--> Federal <--RelatedTo--> Express 
Popular <--RelatedTo--> School <--AtLocation-- Food <--RelatedTo--> Need <--Antonym--> Sufficient 