kingdom come vs futurity

kingdom come and futurity both are nouns.

Word	Noun	Adjective	Verb	Adverb
kingdom come	Yes	No	No	No
futurity	Yes	No	No	No

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

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

kingdom come (noun)	futurity (noun)
the end of time	the quality of being in or of the future
the next world	the time yet to come