forerunner vs doer

forerunner and doer both are nouns.

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

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

Other hypernyms of forerunner include actor, worker.

forerunner (noun)	doer (noun)
something that precedes and indicates the approach of something or someone	a person who acts and gets things done
a person who goes before or announces the coming of another
anything that precedes something similar in time