Operation is related to Patient. Patient is related to Inmate. Inmate is the opposite of Guard. 
Describe is related to Illustrate. Illustrate is a type of Picture. Picture is related to Visual. Visual is related to Illusion. 
Operation <--RelatedTo--> Patient <--RelatedTo--> Inmate <--Antonym--> Guard 
Describe <--RelatedTo--> Illustrate --IsA--> Picture <--RelatedTo--> Visual <--RelatedTo--> Illusion 