Debate is a synonym of Contest. Game is a type of Contest. you are likely to find Marble in/at/on Game. 
Passenger is a different concept from Driver. Driver is related to Captain. Captain is a synonym of Supervisor. 
Debate <--Synonym--> Contest <--IsA-- Game <--AtLocation-- Marble 
Passenger <--DistinctFrom--> Driver <--RelatedTo--> Captain <--Synonym--> Supervisor 