need vs necessary

need and necessary both are nouns.

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

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

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

need (noun)	necessary (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	anything indispensable
anything that is necessary but lacking
a condition requiring relief
a state of extreme poverty or destitution

need (adjective)	necessary (adjective)
	absolutely essential
	unavoidably determined by prior circumstances

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