Structural is related to Beam. Beam is related to Metal. Metal is related to Medal. 
Quarterback is a type of Back. Back is a synonym of Endorse. Endorse is related to Sign. 
Structural <--RelatedTo--> Beam <--RelatedTo--> Metal <--RelatedTo--> Medal 
Quarterback --IsA--> Back <--Synonym--> Endorse <--RelatedTo--> Sign 