Spill is a synonym of Fall. Fall is a synonym of Plunge. Plunge is related to Force. 
Army is related to Base. Base is related to Wave. Wave is related to Water. Ocean is made of Water. 
Spill <--Synonym--> Fall <--Synonym--> Plunge <--RelatedTo--> Force 
Army <--RelatedTo--> Base <--RelatedTo--> Wave <--RelatedTo--> Water <--MadeOf-- Ocean 