requirement vs require

requirement is a noun but require is not a noun.

Word	Noun	Adjective	Verb	Adverb
requirement	Yes	No	No	No
require	No	No	Yes	No

requirement (noun)	require (noun)
something that is required in advance
required activity
anything indispensable

requirement (verb)	require (verb)
	make someone do something
	consider obligatory; request and expect
	have need of
	require as useful, just, or proper