Expand is the opposite of Contract. Contract is a type of Bridge. 
Realm is a synonym of Sphere. Sphere is related to Ball. Ball is related to Marble. Marble is related to Bullet. 
Expand <--Antonym--> Contract --IsA--> Bridge 
Realm <--Synonym--> Sphere <--RelatedTo--> Ball <--RelatedTo--> Marble <--RelatedTo--> Bullet 