Prisoner is the opposite of Free. Free is related to Democracy. Democracy is related to Liberty. Liberty is related to Liver. 
Supposed is a form of Suppose. Suppose is a synonym of Assume. Resume is a type of Assume. 
Prisoner <--Antonym--> Free <--RelatedTo--> Democracy <--RelatedTo--> Liberty <--RelatedTo--> Liver 
Supposed --FormOf--> Suppose <--Synonym--> Assume <--IsA-- Resume 