subject vs doer

subject and doer both are nouns.

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

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

Other hypernyms of subject include actor, worker.

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

subject: a person who is subjected to experimental or other observational procedures; someone who is an object of investigation
doer: a person who acts and gets things done

Other hypernyms of subject include actor, worker.

subject (noun)	doer (noun)
something (a person or object or scene) selected by an artist or photographer for graphic representation	a person who acts and gets things done
a branch of knowledge
some situation or event that is thought about
the subject matter of a conversation or discussion
(grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated
(logic) the first term of a proposition
a person who owes allegiance to that nation
a person who is subjected to experimental or other observational procedures; someone who is an object of investigation

subject (adjective)	doer (adjective)
likely to be affected by something
being under the power or sovereignty of another or others
possibly accepting or permitting

subject (verb)	doer (verb)
make accountable for
cause to experience or suffer or make liable or vulnerable to
make subservient; force to submit or subdue