Clerk is a type of Profession. Profession is related to Psychologist. 
World is related to History. History is related to Native. Native is the opposite of Foreigner. Foreigner is a type of Traveler. 
Clerk --IsA--> Profession <--RelatedTo--> Psychologist 
World <--RelatedTo--> History <--RelatedTo--> Native <--Antonym--> Foreigner --IsA--> Traveler 