struggler vs doer

struggler and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
struggler	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of struggler; that is, doer is a word with a broader meaning than struggler:

Other hypernyms of struggler include actor, worker.

struggler (noun)	doer (noun)
a person who struggles with difficulties or with great effort	a person who acts and gets things done