deserter, apostate, renegade, turncoat, recreant, ratter -- (a disloyal person who betrays or deserts his cause or religion or political party or friend etc.)
Overview of adj recreant
The adj recreant has 2 senses
recreant, renegade -- (having deserted a cause or principle; "some provinces had proved recreant"; "renegade supporters of the usurper")
craven, recreant -- (lacking even the rudiments of courage; abjectly fearful; "the craven fellow turned and ran"; "a craven proposal to raise the white flag"; "this recreant knight"- Spenser)