eristic vs eristical

eristic is a noun but eristical is not a noun.

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

As adjectives, eristic and eristical are synonyms defined as:

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

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

eristic (adjective)	eristical (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