druidism vs heathenism

druidism and heathenism both are nouns.

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

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

druidism: the system of religion and philosophy taught by the Druids and their rites and ceremonies
heathenism: any of various religions other than Christianity or Judaism or Islamism

Other hypernyms of druidism include pagan religion, paganism.

druidism (noun)	heathenism (noun)
the system of religion and philosophy taught by the Druids and their rites and ceremonies	any of various religions other than Christianity or Judaism or Islamism