ratter vs quitter

ratter and quitter both are nouns.

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

As nouns, quitter is a hypernym of ratter; that is, quitter is a word with a broader meaning than ratter:

ratter: a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
quitter: a person who gives up too easily

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