future vs tomorrow

future and tomorrow both are nouns.

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

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

Other hyponyms of future include kingdom come, by-and-by, offing, manana.

future (noun)	tomorrow (noun)
bulk commodities bought or sold at an agreed price for delivery at a specified future date	the near future
a verb tense that expresses actions or states in the future	the day after today
the time yet to come

future (adjective)	tomorrow (adjective)
yet to be or coming
a verb tense or other formation referring to events or states that have not yet happened
(of elected officers) elected but not yet serving
effective in or looking toward the future

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