posit vs assert

posit is a noun but assert is not a noun.

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

As verbs, assert is a hyponym of posit; that is, assert is a word with a more specific, narrower meaning than posit:

Other hyponyms of posit include insist.

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

posit (verb)	assert (verb)
take as a given; assume as a postulate or axiom	postulate positively and assertively
put before	to declare or affirm solemnly and formally as true
put (something somewhere) firmly	state categorically
	insist on having one's opinions and rights recognized