modifier vs doer

modifier and doer both are nouns.

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

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

Other hypernyms of modifier include actor, worker.

modifier (noun)	doer (noun)
a gene that modifies the effect produced by another gene	a person who acts and gets things done
a content word that qualifies the meaning of a noun or verb
a person who changes something
a moderator who makes less extreme or uncompromising