argumentation vs discussion

argumentation and discussion both are nouns.

Word	Noun	Adjective	Verb	Adverb
argumentation	Yes	No	No	No
discussion	Yes	No	No	No

As nouns, discussion is a hypernym of argumentation; that is, discussion is a word with a broader meaning than argumentation:

argumentation: a discussion in which reasons are advanced for and against some proposition or proposal
discussion: an exchange of views on some topic

Other hypernyms of argumentation include give-and-take, word.

argumentation (noun)	discussion (noun)
a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning	an exchange of views on some topic
a discussion in which reasons are advanced for and against some proposition or proposal	an extended communication (often interactive) dealing with some particular topic