Sign is a type of Communicate. Sign is related to Metal. Metal is related to Raw. Raw is related to Bread. 
Shadow is a synonym of Trace. Trace is a type of Mark. Mark is a synonym of Notice. Notice is a type of React. 
Communicate <--IsA-- Sign <--RelatedTo--> Metal <--RelatedTo--> Raw <--RelatedTo--> Bread 
Shadow <--Synonym--> Trace --IsA--> Mark <--Synonym--> Notice --IsA--> React 