Prevail is a synonym of Triumph. Triumph is the opposite of Failure. Failure is the opposite of Success. Success is related to Secret. 
you are likely to find King in/at/on Court. Court is related to Trial. Defense is part of Trial. Defense is related to Shell. 
Prevail <--Synonym--> Triumph <--Antonym--> Failure <--Antonym--> Success <--RelatedTo--> Secret 
King --AtLocation--> Court <--RelatedTo--> Trial <--PartOf-- Defense <--RelatedTo--> Shell 