Defector
The Century Dictionary and Cyclopedia
noun.
One who defects, falls away, deserts, or secedes, as from a religious body, a political party, or the like.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
one who
defects
.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a person who abandons their duty (as on a military post)