hereinafter vs hereunder

hereinafter and hereunder both are adverbs.

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

As adverbs, hereinafter and hereunder are synonyms defined as:

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

Other synonyms of hereinafter include hereafter.

hereinafter (adverb)	hereunder (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