Prevent is the opposite of Cause. Facilitate is a type of Cause. 
Brave is similar to Desperate. Desperate is similar to Dangerous. Dangerous is related to Bear. Bear is related to Body. 
Prevent <--Antonym--> Cause <--IsA-- Facilitate 
Brave <--SimilarTo--> Desperate <--SimilarTo--> Dangerous <--RelatedTo--> Bear <--RelatedTo--> Body 