tomorrow vs futurity

tomorrow and futurity both are nouns.

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

As nouns, futurity is a hypernym of tomorrow; that is, futurity is a word with a broader meaning than tomorrow:

Other hypernyms of tomorrow include future, hereafter, time to come.

tomorrow (noun)	futurity (noun)
the near future	the quality of being in or of the future
the day after today	the time yet to come

tomorrow (adverb)	futurity (adverb)
the next day, the day after, following the present day