Surrogate
Part of speech: verb
Definition: To replace or substitute something with something else; appoint a successor.
Part of speech: adjective
Definition: Of, concerning, relating to or acting as a substitute.
Part of speech: noun
Definition: A substitute (usually of a person, position or role). A person or animal that acts as a substitute for the social or pastoral role of another, such as a surrogate mother. A deputy for a bishop in granting licences for marriage. A judicial officer of limited jurisdiction, who administers matters of probate and intestate succession and, in some cases, adoptions. A surrogate or surrogate key is a unique identifier for either an entity in the modeled world or an object in the database.
Example sentence: Most American films have now become mindless. The human element has been removed, so you are just left with the surrogate human, which is the robot, so coincidentally or, rather, ironically, they are making films about robots, without realising they are talking about themselves.
Deputy
Part of speech: noun
Definition: One appointed as the substitute of another, and empowered to act for him, in his name or his behalf; a substitute in office; a lieutenant; a representative; a delegate; a vicegerent; as, the deputy of a prince, of a sheriff, of a township, etc.(in France): A member of the Chamber of Deputies, formerly called Corps Législatif(Ireland) a member of Dáil Éireann, or the title of a member of Dáil Éireann. (Normally capitalised in both cases)
Example sentence: I was the deputy Chairman of the Democratic Union of the Pacific, and we started at 8 I think and I was called to the telephone and to be told there's a coup, the government has been overthrown - it was round about 9, 10 when the Parliament sat they had done then.