heathenism vs religion

heathenism and religion both are nouns.

Word	Noun	Adjective	Verb	Adverb
heathenism	Yes	No	No	No
religion	Yes	No	No	No

As nouns, religion is a hypernym of heathenism; that is, religion is a word with a broader meaning than heathenism:

heathenism: any of various religions other than Christianity or Judaism or Islamism
religion: a strong belief in a supernatural power or powers that control human destiny

Other hypernyms of heathenism include faith, religious belief.

heathenism (noun)	religion (noun)
any of various religions other than Christianity or Judaism or Islamism	a strong belief in a supernatural power or powers that control human destiny
	an institution to express belief in a divine power