olive branch vs offering

olive branch and offering both are nouns.

Word	Noun	Adjective	Verb	Adverb
olive branch	Yes	No	No	No
offering	Yes	No	No	No

As nouns, offering is a hypernym of olive branch; that is, offering is a word with a broader meaning than olive branch:

olive branch: something offered to an adversary in the hope of obtaining peace
offering: something offered (as a proposal or bid)

Other hypernyms of olive branch include offer.

olive branch (noun)	offering (noun)
something offered to an adversary in the hope of obtaining peace	the act of contributing to the funds of a church or charity
	something offered (as a proposal or bid)
	the verbal act of offering
	money contributed to a religious organization; item or items contributed to a religious organization for religious purposes