quitter vs dropout

quitter and dropout both are nouns.

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

As nouns, dropout is a hyponym of quitter; that is, dropout is a word with a more specific, narrower meaning than quitter:

Other hyponyms of quitter include abdicator, apostate, deserter, ratter, recreant, renegade, turncoat.

quitter (noun)	dropout (noun)
a person who gives up too easily	someone who quits school before graduation
	someone who withdraws from a social group or environment