Southern is derived from South. Southwest is derived from South. Southwest is the opposite of Northeast. Northeast is similar to Northwest. 
Tap is a type of Withdraw. Withdraw is a synonym of Swallow. Swallow is related to Process. 
Southern --DerivedFrom--> South <--DerivedFrom-- Southwest <--Antonym--> Northeast <--SimilarTo--> Northwest 
Tap --IsA--> Withdraw <--Synonym--> Swallow <--RelatedTo--> Process 