Northwest is a type of Location. Location is related to Course. Course is related to River. you are likely to find River in/at/on Continent. 
Logic is related to Order. Order is the opposite of Suggestion. 
Northwest --IsA--> Location <--RelatedTo--> Course <--RelatedTo--> River --AtLocation--> Continent 
Logic <--RelatedTo--> Order <--Antonym--> Suggestion 