Northern is the opposite of Southern. Southern is derived from South. South is a type of Location. Location is related to Side. 
Salt is related to Dinner. Dinner is related to Bill. Bill is related to Accounting. 
Northern <--Antonym--> Southern --DerivedFrom--> South --IsA--> Location <--RelatedTo--> Side 
Salt <--RelatedTo--> Dinner <--RelatedTo--> Bill <--RelatedTo--> Accounting 