Thin is related to Steam. Steam is related to River. River is related to Coast. Coast is related to Rim. 
Competitor is a synonym of Rival. Scratch is a type of Rival. Scratch is a synonym of Strike. Strike is a type of Make. 
Thin <--RelatedTo--> Steam <--RelatedTo--> River <--RelatedTo--> Coast <--RelatedTo--> Rim 
Competitor <--Synonym--> Rival <--IsA-- Scratch <--Synonym--> Strike --IsA--> Make 