8 letters · 9 points in Scrabble
noun a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
noun a person who abandons their duty (as on a military post)
originBorrowed from Latin desertor (“deserter”), from desero (“to forsake, to abandon”); or from desert + -er.
Etymology from Wiktionary, CC BY-SA 3.0