ethnic vs heathenish

ethnic is a noun but heathenish is not a noun.

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

As adjectives, ethnic and heathenish are synonyms defined as:

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

Other synonyms of ethnic include heathen, pagan.

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

ethnic (adjective)	heathenish (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