Travel requires Energy. Energy is related to Drink. Drink is related to General. 
Refugee is a type of Civilian. Civilian is a type of Citizen. Citizen is the opposite of Immigrant. 
Travel --HasPrerequisite--> Energy <--RelatedTo--> Drink <--RelatedTo--> General 
Refugee --IsA--> Civilian --IsA--> Citizen <--Antonym--> Immigrant 