asseverate vs say

asseverate is not a noun while say is a noun.

Word	Noun	Adjective	Verb	Adverb
asseverate	No	No	Yes	No
say	Yes	No	Yes	No

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

Other hyponyms of asseverate include allege, aver, predicate, proclaim.

asseverate (noun)	say (noun)
	the chance to speak

asseverate (verb)	say (verb)
state categorically	express in words
	report or maintain
	speak, pronounce, or utter in a certain way
	express a supposition
	give instructions to or direct somebody to do something with authority
	communicate or express nonverbally
	recite or repeat a fixed text
	indicate
	state as one's opinion or judgement; declare
	utter aloud
	have or contain a certain wording or form