Bureau is a synonym of Agency. Agency is related to Intelligence. Intelligence is related to Military. Military is related to Service. 
Post is related to Barrier. Bar is a type of Barrier. Bar is related to Candy. 
Bureau <--Synonym--> Agency <--RelatedTo--> Intelligence <--RelatedTo--> Military <--RelatedTo--> Service 
Post <--RelatedTo--> Barrier <--IsA-- Bar <--RelatedTo--> Candy 