Exam is related to Pass. Pass is a synonym of Head. Head is a synonym of Summit. 
Pay is related to Salary. Salary is related to Servant. Servant is related to Household. 
Exam <--RelatedTo--> Pass <--Synonym--> Head <--Synonym--> Summit 
Pay <--RelatedTo--> Salary <--RelatedTo--> Servant <--RelatedTo--> Household 