heathenish vs ethnic

heathenish is not a noun while ethnic is a noun.

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

As adjectives, heathenish and ethnic are synonyms defined as:

heathenish and ethnic: not acknowledging the God of Christianity and Judaism and Islam

Other synonyms of heathenish include heathen, pagan.

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

heathenish (adjective)	ethnic (adjective)
not acknowledging the God of Christianity and Judaism and Islam	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