need vs requirement

need and requirement both are nouns.

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

As nouns, requirement is a hypernym of need; that is, requirement is a word with a broader meaning than need:

Other hypernyms of need include essential, necessary, necessity, requisite.

need (noun)	requirement (noun)
the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior	something that is required in advance
anything that is necessary but lacking	required activity
a condition requiring relief	anything indispensable
a state of extreme poverty or destitution

need (verb)	requirement (verb)
have need of
have or feel a need for
require as useful, just, or proper