Politician is related to Minister. Minister is related to Official. Official is related to Republic. 
Last is similar to Unlikely. Unlikely is a synonym of Unlike. Unlike is a synonym of Diverse. 
Politician <--RelatedTo--> Minister <--RelatedTo--> Official <--RelatedTo--> Republic 
Last <--SimilarTo--> Unlikely <--Synonym--> Unlike <--Synonym--> Diverse 