dropout vs quitter

dropout and quitter both are nouns.

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

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

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