heathen vs heathenish

heathen is a noun but heathenish is not a noun.

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

As adjectives, heathen and heathenish are synonyms defined as:

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

Other synonyms of heathen include ethnic, pagan.

heathen (noun)	heathenish (noun)
a person who does not acknowledge your god

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