Eye is related to Tear. Tire is etymologically related to Tear. Exhaust is a type of Tire. Exhaust is related to Emission. 
Fighter is derived from Fight. Fight is a synonym of Oppose. Oppose is a synonym of Contest. Contest is a synonym of Controversy. 
Eye <--RelatedTo--> Tear <--EtymologicallyRelatedTo-- Tire <--IsA-- Exhaust <--RelatedTo--> Emission 
Fighter --DerivedFrom--> Fight <--Synonym--> Oppose <--Synonym--> Contest <--Synonym--> Controversy 