linguist vs doer

linguist and doer both are nouns.

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

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

Other hypernyms of linguist include actor, worker.

linguist (noun)	doer (noun)
a person who speaks more than one language	a person who acts and gets things done
a specialist in linguistics