turncoat vs ratter

turncoat and ratter both are nouns.

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

As nouns, turncoat and ratter are synonyms defined as:

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

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

turncoat (noun)	ratter (noun)
a disloyal person who betrays or deserts his cause or religion or political party or friend etc.	any of several breeds of terrier developed to catch rats
	a disloyal person who betrays or deserts his cause or religion or political party or friend etc.