From The Collaborative International Dictionary of English v.0.48:
Deceiver \De*ceiv"er\, n.
One who deceives; one who leads into error; a cheat; an
impostor.
[1913 Webster]
The deceived and the deceiver are his. --Job xii. 16.
Usage: A deceiver operates by stealth and in private upon
individuals; an impostor practices his arts on the
community at large. The one succeeds by artful
falsehoods, the other by bold assumption. The
faithless friend and the fickle lover are deceivers;
the false prophet and the pretended prince are
impostors.
[1913 Webster]