Heat is related to Promise. Promise is related to Resolution. Resolution is a synonym of Settlement. 
Chemical is a type of Material. Material is related to Bar. Bolt is a type of Bar. Bolt is related to Lightning. 
Heat <--RelatedTo--> Promise <--RelatedTo--> Resolution <--Synonym--> Settlement 
Chemical --IsA--> Material <--RelatedTo--> Bar <--IsA-- Bolt <--RelatedTo--> Lightning 