hereafter vs manana

hereafter and manana both are nouns.

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

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

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

hereafter (noun)	manana (noun)
the time yet to come	an unspecified time in the future
life after death

hereafter (adverb)	manana (adverb)
in a subsequent part of this document or statement or matter etc.
following this in time or order or place; after this
in a future life or state