turncoat vs deserter

turncoat and deserter both are nouns.

Word	Noun	Adjective	Verb	Adverb
turncoat	Yes	No	No	No
deserter	Yes	No	No	No

As nouns, turncoat and deserter are synonyms defined as:

turncoat and deserter: a disloyal person who betrays or deserts his cause or religion or political party or friend etc.

Other synonyms of turncoat include apostate, ratter, recreant, renegade.

turncoat (noun)	deserter (noun)
a disloyal person who betrays or deserts his cause or religion or political party or friend etc.	a person who abandons their duty (as on a military post)
	a disloyal person who betrays or deserts his cause or religion or political party or friend etc.