futurity vs manana

futurity and manana both are nouns.

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

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

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

futurity (noun)	manana (noun)
the quality of being in or of the future	an unspecified time in the future
the time yet to come