Cover is related to Book. Broker is a type of Book. 
Restore is a synonym of Repair. Fill is a type of Repair. Fill is related to Silver. Silver is related to Aluminum. 
Cover <--RelatedTo--> Book <--IsA-- Broker 
Restore <--Synonym--> Repair <--IsA-- Fill <--RelatedTo--> Silver <--RelatedTo--> Aluminum 