helper vs offeror

helper and offeror both are nouns.

Word	Noun	Adjective	Verb	Adverb
helper	Yes	No	No	No
offeror	Yes	No	No	No

As nouns, offeror is a hyponym of helper; that is, offeror is a word with a more specific, narrower meaning than helper:

helper: a person who helps people or institutions (especially with financial help)
offeror: someone who presents something to another for acceptance or rejection

helper (noun)	offeror (noun)
a person who helps people or institutions (especially with financial help)	someone who presents something to another for acceptance or rejection
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose