postulation vs message

postulation and message both are nouns.

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

As nouns, message is a hypernym of postulation; that is, message is a word with a broader meaning than postulation:

postulation: a formal message requesting something that is submitted to an authority
message: content communicating a message; what something is about

Other hypernyms of postulation include content, subject matter, substance.

postulation (noun)	message (noun)
(logic) a declaration of something self-evident; something that can be assumed as the basis for argument	content communicating a message; what something is about
a formal message requesting something that is submitted to an authority	a communication (usually brief) that is written or spoken or signaled