postulation vs demand

postulation and demand both are nouns.

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

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

postulation: a formal message requesting something that is submitted to an authority
demand: an urgent or peremptory request

Other hyponyms of postulation include application, appeal, collection, ingathering, solicitation.

postulation (noun)	demand (noun)
(logic) a declaration of something self-evident; something that can be assumed as the basis for argument	the act of demanding
a formal message requesting something that is submitted to an authority	required activity
	an urgent or peremptory request
	the ability and desire to purchase goods and services
	a condition requiring relief

postulation (verb)	demand (verb)
	request urgently and forcefully
	claim as due or just
	summon to court
	ask to be informed of
	lay legal claim to
	require as useful, just, or proper