druidism vs pagan religion

druidism and pagan religion both are nouns.

Word	Noun	Adjective	Verb	Adverb
druidism	Yes	No	No	No
pagan religion	Yes	No	No	No

As nouns, pagan religion is a hypernym of druidism; that is, pagan religion 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
pagan religion: any of various religions other than Christianity or Judaism or Islamism

Other hypernyms of druidism include heathenism, paganism.

druidism (noun)	pagan religion (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