argumentation vs line of reasoning

argumentation and line of reasoning both are nouns.

Word	Noun	Adjective	Verb	Adverb
argumentation	Yes	No	No	No
line of reasoning	Yes	No	No	No

As nouns, argumentation and line of reasoning are synonyms defined as:

argumentation and line of reasoning: a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning

Other synonyms of argumentation include argument, line, logical argument.

argumentation (noun)	line of reasoning (noun)
a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning	a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning
a discussion in which reasons are advanced for and against some proposition or proposal