Fitness is a synonym of Health. Health is related to Overall. Overall is a synonym of Big. Big is a synonym of Large. 
Oil is related to Spill. Spill is a type of Reduce. 
Fitness <--Synonym--> Health <--RelatedTo--> Overall <--Synonym--> Big <--Synonym--> Large 
Oil <--RelatedTo--> Spill --IsA--> Reduce 