expostulate vs argue

expostulate and argue both are verbs.

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

As verbs, argue is a hypernym of expostulate; that is, argue is a word with a broader meaning than expostulate:

Other hypernyms of expostulate include reason.

expostulate (verb)	argue (verb)
reason with (somebody) for the purpose of dissuasion	have an argument about something
	give evidence of
	present reasons and arguments