Afraid is the opposite of Brave. Brave is related to Courage. Courage is a type of Virtue. 
Drive is a type of Operate. Drive is related to Activity. Activity is related to Hunt. 
Afraid <--Antonym--> Brave <--RelatedTo--> Courage --IsA--> Virtue 
Operate <--IsA-- Drive <--RelatedTo--> Activity <--RelatedTo--> Hunt 