ethnical vs ethnic

ethnical is not a noun while ethnic is a noun.

Word	Noun	Adjective	Verb	Adverb
ethnical	No	Yes	No	No
ethnic	Yes	Yes	No	No

As adjectives, ethnical and ethnic are synonyms defined as:

ethnical and ethnic: denoting or deriving from or distinctive of the ways of living built up by a group of people

Other synonyms of ethnical include cultural.

ethnical (noun)	ethnic (noun)
	a person who is a member of an ethnic group

ethnical (adjective)	ethnic (adjective)
denoting or deriving from or distinctive of the ways of living built up by a group of people	not acknowledging the God of Christianity and Judaism and Islam
	denoting or deriving from or distinctive of the ways of living built up by a group of people