deserter (n.)

• absconder
• apostasy
• apostate
• atheist
• backslider
• betrayal
• blasphemer
• bolt
• breakaway
• collaborationist
• collaborator
• convert
• defection
• defector
• dereliction
• desertion
• escapee
• fugitive
• mugwump
• outlaw
• proselyte
• quisling
• rat
• ratting
• recidivist
• recreant
• renegade
• reversionist
• runaway
• schism
• secession
• secessionist
• separatist
• strikebreaker
• tergiversator
• traitor
• turnabout
• turncoat
• walkout