Roman Catholicism vs papism

Roman Catholicism and papism both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman Catholicism	Yes	No	No	No
papism	Yes	No	No	No

As nouns, Roman Catholicism and papism are synonyms defined as:

Roman Catholicism and papism: the beliefs and practices of the Catholic Church based in Rome

Other synonyms of Roman Catholicism include Romanism.

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