hereunder vs hereinafter

hereunder and hereinafter both are adverbs.

Word	Noun	Adjective	Verb	Adverb
hereunder	No	No	No	Yes
hereinafter	No	No	No	Yes

As adverbs, hereunder and hereinafter are synonyms defined as:

hereunder and hereinafter: in a subsequent part of this document or statement or matter etc.

Other synonyms of hereunder include hereafter.

hereunder (adverb)	hereinafter (adverb)
in a subsequent part of this document or statement or matter etc.	in a subsequent part of this document or statement or matter etc.
under the terms of this agreement