Issue is a synonym of Question. Question is related to Symbol. Symbol is related to Division. Division is related to Function. 
Bush is related to Politician. Politician is related to Government. Government is related to Corruption. 
Issue <--Synonym--> Question <--RelatedTo--> Symbol <--RelatedTo--> Division <--RelatedTo--> Function 
Bush <--RelatedTo--> Politician <--RelatedTo--> Government <--RelatedTo--> Corruption 