futurity vs offing

futurity and offing both are nouns.

Word	Noun	Adjective	Verb	Adverb
futurity	Yes	No	No	No
offing	Yes	No	No	No

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

Other hyponyms of futurity include kingdom come, by-and-by, tomorrow, manana.

futurity (noun)	offing (noun)
the quality of being in or of the future	the part of the sea that can be seen from the shore and is beyond the anchoring area
the time yet to come	the near or foreseeable future