Prevent is related to Action. Action is related to Hide. Hide is the opposite of Expose. Expose is a type of Abandon. 
Do is a synonym of Finish. Finish is the opposite of Begin. 
Prevent <--RelatedTo--> Action <--RelatedTo--> Hide <--Antonym--> Expose --IsA--> Abandon 
Do <--Synonym--> Finish <--Antonym--> Begin 