papism vs popery

papism and popery both are nouns.

Word	Noun	Adjective	Verb	Adverb
papism	Yes	No	No	No
popery	Yes	No	No	No

As nouns, papism and popery are synonyms defined as:

papism and popery: offensive terms for the practices and rituals of the Roman Catholic Church

papism (noun)	popery (noun)
offensive terms for the practices and rituals of the Roman Catholic Church	offensive terms for the practices and rituals of the Roman Catholic Church
the beliefs and practices of the Catholic Church based in Rome