Debt is the opposite of Lend. Lend is the opposite of Borrow. Borrow is etymologically related to Bury. 
Continent is related to Land. Land is related to Field. Campus is a type of Field. 
Debt <--Antonym--> Lend <--Antonym--> Borrow --EtymologicallyRelatedTo--> Bury 
Continent <--RelatedTo--> Land <--RelatedTo--> Field <--IsA-- Campus 