Vulnerable is the opposite of Powerful. Powerful is related to God. God is related to Power. Power is related to Oil. 
Merchant is related to Title. Title is a synonym of Style. 
Vulnerable <--Antonym--> Powerful <--RelatedTo--> God <--RelatedTo--> Power <--RelatedTo--> Oil 
Merchant <--RelatedTo--> Title <--Synonym--> Style 