dialectical vs dialectic

dialectical is not a noun while dialectic is a noun.

Word	Noun	Adjective	Verb	Adverb
dialectical	No	Yes	No	No
dialectic	Yes	Yes	No	No

As adjectives, dialectical and dialectic are synonyms defined as:

dialectical (noun)	dialectic (noun)
	any formal system of reasoning that arrives at the truth by the exchange of logical arguments
	a contradiction of ideas that serves as the determining factor in their interaction

dialectical (adjective)	dialectic (adjective)
of or relating to or employing dialectic	of or relating to or employing dialectic