Psychology is related to Subject. Subject is the opposite of Citizen. Citizen is related to City. City is related to Habitat. 
Character is a synonym of Reference. Reference is a synonym of Extension. Extension is a type of Expansion. 
Psychology <--RelatedTo--> Subject <--Antonym--> Citizen <--RelatedTo--> City <--RelatedTo--> Habitat 
Character <--Synonym--> Reference <--Synonym--> Extension --IsA--> Expansion 