solicitation vs postulation

solicitation and postulation both are nouns.

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

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

solicitation: request for a sum of money
postulation: a formal message requesting something that is submitted to an authority

Other hypernyms of solicitation include petition, request.

solicitation (noun)	postulation (noun)
the act of enticing a person to do something wrong (as an offer of sex in return for money)	(logic) a declaration of something self-evident; something that can be assumed as the basis for argument
an entreaty addressed to someone of superior status	a formal message requesting something that is submitted to an authority
request for a sum of money