expostulate vs expostulation

expostulate is not a noun while expostulation is a noun.

Word	Noun	Adjective	Verb	Adverb
expostulate	No	No	Yes	No
expostulation	Yes	No	No	No

expostulate (noun)	expostulation (noun)
	the act of expressing earnest opposition or protest
	an exclamation of protest or remonstrance or reproof

expostulate (verb)	expostulation (verb)
reason with (somebody) for the purpose of dissuasion