Category is related to News. News is related to Novel. Novel is related to Literature. 
Step is related to Gate. Gate is related to Outside. Outside is the opposite of Room. Room is related to Couch. 
Category <--RelatedTo--> News <--RelatedTo--> Novel <--RelatedTo--> Literature 
Step <--RelatedTo--> Gate <--RelatedTo--> Outside <--Antonym--> Room <--RelatedTo--> Couch 