Leader is a synonym of Driver. Driver is the opposite of Passenger. Passenger is related to Cab. 
you are likely to find Oxygen in/at/on Earth. Fire requires Oxygen. Fire is related to Man. 
Leader <--Synonym--> Driver <--Antonym--> Passenger <--RelatedTo--> Cab 
Earth <--AtLocation-- Oxygen <--HasPrerequisite-- Fire <--RelatedTo--> Man 