collection vs postulation

collection and postulation both are nouns.

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

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

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

Other hypernyms of collection include petition, request.

collection (noun)	postulation (noun)
the act of gathering something together	(logic) a declaration of something self-evident; something that can be assumed as the basis for argument
a publication containing a variety of works	a formal message requesting something that is submitted to an authority
request for a sum of money
several things grouped together or considered as a whole