Allow is a synonym of Own. Own is the opposite of Rent. Rent is a synonym of Rental. 
Instructor is the opposite of Student. Student is related to Classroom. Classroom is related to Desk. 
Allow <--Synonym--> Own <--Antonym--> Rent <--Synonym--> Rental 
Instructor <--Antonym--> Student <--RelatedTo--> Classroom <--RelatedTo--> Desk 