Stuff is the opposite of Trade. Trade is related to Free. Free is the opposite of Price. Price is a synonym of Toll. 
Driving can be Fun. Parking is a type of Driving. 
Stuff <--Antonym--> Trade <--RelatedTo--> Free <--Antonym--> Price <--Synonym--> Toll 
Fun <--HasProperty-- Driving <--IsA-- Parking 