faller vs doer

faller and doer both are nouns.

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

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

Other hypernyms of faller include actor, worker.

faller (noun)	doer (noun)
a person who falls	a person who acts and gets things done
a person who fells trees