posit vs propose

posit is a noun but propose is not a noun.

Word	Noun	Adjective	Verb	Adverb
posit	Yes	No	Yes	No
propose	No	No	Yes	No

As verbs, propose is a hypernym of posit; that is, propose is a word with a broader meaning than posit:

Other hypernyms of posit include advise, suggest.

posit (noun)	propose (noun)
(logic) a proposition that is accepted as true in order to provide a basis for logical reasoning

posit (verb)	propose (verb)
take as a given; assume as a postulate or axiom	present for consideration, examination, criticism, etc.
put before	propose or intend
put (something somewhere) firmly	make a proposal, declare a plan for something
	ask (someone) to marry you
	put forward; nominate for appointment to an office or for an honor or position