Part is related to Oil. Oil is related to Essence. Essence is a synonym of Sum. Sum is a type of Whole. 
Citizen is the opposite of Immigrant. Immigrant is a type of Person. Intellectual is a type of Person. Intellectual is similar to Rational. 
Part <--RelatedTo--> Oil <--RelatedTo--> Essence <--Synonym--> Sum --IsA--> Whole 
Citizen <--Antonym--> Immigrant --IsA--> Person <--IsA-- Intellectual <--SimilarTo--> Rational 