assertion vs assert

assertion is a noun but assert is not a noun.

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

assertion (noun)	assert (noun)
a declaration that is made emphatically (as if no supporting evidence were necessary)
the act of affirming or asserting or stating something

assertion (verb)	assert (verb)
	postulate positively and assertively
	to declare or affirm solemnly and formally as true
	state categorically
	insist on having one's opinions and rights recognized