Illusion is a type of Appearance. Illusion is related to Image. Image is a synonym of Picture. 
Dream is related to Escape. Escape is related to Great. Great is the opposite of Awful. Awful is the opposite of Nice. 
Appearance <--IsA-- Illusion <--RelatedTo--> Image <--Synonym--> Picture 
Dream <--RelatedTo--> Escape <--RelatedTo--> Great <--Antonym--> Awful <--Antonym--> Nice 