precursor vs actor

precursor and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
precursor	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of precursor; that is, actor is a word with a broader meaning than precursor:

Other hypernyms of precursor include doer, worker.

precursor (noun)	actor (noun)
something that precedes and indicates the approach of something or someone	a theatrical performer
a person who goes before or announces the coming of another	a person who acts and gets things done
a substance from which another substance is formed (especially by a metabolic reaction)