Box is related to Object. Object is related to Weight. Weight is related to Heavy. Heavy is related to Gravity. 
Characteristic is related to Age. Age is a synonym of Era. Era is related to Literature. 
Box <--RelatedTo--> Object <--RelatedTo--> Weight <--RelatedTo--> Heavy <--RelatedTo--> Gravity 
Characteristic <--RelatedTo--> Age <--Synonym--> Era <--RelatedTo--> Literature 