Offensive is the opposite of Defensive. Defensive is a type of Attitude. Attitude is related to State. State is a synonym of Accident. 
Compromise is a type of Cooperation. Cooperation is the opposite of Competition. Arena can be used for Competition. Arena is related to Course. 
Offensive <--Antonym--> Defensive --IsA--> Attitude <--RelatedTo--> State <--Synonym--> Accident 
Compromise --IsA--> Cooperation <--Antonym--> Competition <--UsedFor-- Arena <--RelatedTo--> Course 