offering vs twofer

offering and twofer both are nouns.

Word	Noun	Adjective	Verb	Adverb
offering	Yes	No	No	No
twofer	Yes	No	No	No

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

offering (noun)	twofer (noun)
the act of contributing to the funds of a church or charity	an offer of two for the price of one
something offered (as a proposal or bid)	a coupon that allows the holder to purchase two items (as two tickets to a play) for the price of one
the verbal act of offering
money contributed to a religious organization; item or items contributed to a religious organization for religious purposes