demand vs want

demand and want both are nouns.

Word	Noun	Adjective	Verb	Adverb
demand	Yes	No	Yes	No
want	Yes	No	Yes	No

As nouns, want is a hyponym of demand; that is, want is a word with a more specific, narrower meaning than demand:

Other hyponyms of demand include deficiency, lack, necessity.

As verbs, want is a hyponym of demand; that is, want is a word with a more specific, narrower meaning than demand:

Other hyponyms of demand include ask, expect, require, clamor, clamour, dun, ask.

demand (noun)	want (noun)
the act of demanding	a specific feeling of desire
required activity	anything that is necessary but lacking
an urgent or peremptory request	a state of extreme poverty
the ability and desire to purchase goods and services	the state of needing something that is absent or unavailable
a condition requiring relief

demand (verb)	want (verb)
request urgently and forcefully	wish or demand the presence of
claim as due or just	have need of
summon to court	hunt or look for; want for a particular reason
ask to be informed of	feel or have a desire for; want strongly
lay legal claim to	be without, lack; be deficient in
require as useful, just, or proper