Contrast is a type of Differ. Contrast is a synonym of Line. Line is related to Phone. Phone is related to Receiver. 
Northwest is similar to Southwest. Southwest is similar to Northeast. Northeast is derived from East. 
Differ <--IsA-- Contrast <--Synonym--> Line <--RelatedTo--> Phone <--RelatedTo--> Receiver 
Northwest <--SimilarTo--> Southwest <--SimilarTo--> Northeast --DerivedFrom--> East 