Duplicate
Part of speech: adjective
Definition: being the same as another; identical. This may exclude the first identical item in a series, but usage is inconsistent.
Part of speech: noun
Definition: One that resembles or corresponds to another; an identical copy.
Part of speech: verb
Definition: to make a copy of to do repeatedly; to do again to produce something equal to
Example sentence: Orchestra had a little brass ensemble on two tracks as well, but the rest was me. I knew I couldn't continue in this direction, even if people liked it, because I can only duplicate myself.
Extra
Part of speech: noun
Definition: A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundryan extra edition of a newspaper, which is printed outside of the normal printing cycle
Part of speech: adverb
Definition: To an extraordinary degree.
Part of speech: adjective
Definition: Beyond what is due, usual, expected, or necessary; additional; supernumerary.Extraordinarily good; superior; as extra work, extra pay.
Example sentence: Remember you are just an extra in everyone else's play.