Room is the opposite of Outside. Outside is related to Space. Angle is a type of Space. Angle is a synonym of Lean. 
Commissioner is a type of Worker. Coach is a type of Worker. Coach is related to Economy. 
Room <--Antonym--> Outside <--RelatedTo--> Space <--IsA-- Angle <--Synonym--> Lean 
Commissioner --IsA--> Worker <--IsA-- Coach <--RelatedTo--> Economy 