Opposition is the opposite of Consent. Consent is a synonym of Agreement. Agreement is related to Treaty. Alliance is a type of Treaty. 
Great is related to Danger. Danger is the opposite of Safety. Safety is related to Health. Health is related to Fit. 
Opposition <--Antonym--> Consent <--Synonym--> Agreement <--RelatedTo--> Treaty <--IsA-- Alliance 
Great <--RelatedTo--> Danger <--Antonym--> Safety <--RelatedTo--> Health <--RelatedTo--> Fit 