Piece is related to Head. you are likely to find Hair in/at/on Head. you are likely to find Hair in/at/on Sink. 
Manager is a synonym of Director. Director is a type of Supervisor. Supervisor is a synonym of Administrator. 
Piece <--RelatedTo--> Head <--AtLocation-- Hair --AtLocation--> Sink 
Manager <--Synonym--> Director --IsA--> Supervisor <--Synonym--> Administrator 