eristical vs eristic

eristical is not a noun while eristic is a noun.

Word	Noun	Adjective	Verb	Adverb
eristical	No	Yes	No	No
eristic	Yes	Yes	No	No

As adjectives, eristical and eristic are synonyms defined as:

eristical and eristic: given to disputation for its own sake and often employing specious arguments

eristical (noun)	eristic (noun)
	the art of logical disputation (especially if specious)
	a person who disputes; who is good at or enjoys controversy

eristical (adjective)	eristic (adjective)
given to disputation for its own sake and often employing specious arguments	given to disputation for its own sake and often employing specious arguments