scientist vs doer

scientist and doer both are nouns.

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

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

Other hypernyms of scientist include actor, worker.

scientist (noun)	doer (noun)
a person with advanced knowledge of one or more sciences	a person who acts and gets things done