earner vs breadwinner

earner and breadwinner both are nouns.

Word	Noun	Adjective	Verb	Adverb
earner	Yes	No	No	No
breadwinner	Yes	No	No	No

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

earner: someone who earn wages in return for their labor
breadwinner: one whose earnings are the primary source of support for their dependents

Other hyponyms of earner include double dipper, garnishee.

earner (noun)	breadwinner (noun)
someone who earn wages in return for their labor	one whose earnings are the primary source of support for their dependents