turncoat[noun]Synonyms: traitor, apostate, backslider, defector, deserter, renegade
Related Words: deserter,
straggler,
betrayer,
quisler,
quisling,
traitor,
spy [TahlilGaran] English Synonym Dictionary ▲
turn‧coat /ˈtɜːnkəʊt $ ˈtɜːrnkoʊt/
noun [countable] someone who stops supporting a political party or group and joins the opposing side:
Casson was publicly criticized as a turncoat and a traitor. [TahlilGaran] Dictionary of Contemporary English ▲