Roman vs papist

Roman and papist both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman	Yes	Yes	No	No
papist	Yes	Yes	No	No

As adjectives, Roman and papist are synonyms defined as:

Other synonyms of Roman include papistic, papistical, popish, R.C., Roman Catholic, Romanist, romish.

Roman (noun)	papist (noun)
a resident of modern Rome	an offensive term for Roman Catholics; originally, a Roman Catholic who was a strong advocate of the papacy
an inhabitant of the ancient Roman Empire

Roman (adjective)	papist (adjective)
of or relating to or supporting Romanism	of or relating to or supporting Romanism
of or relating to or derived from Rome (especially ancient Rome)
characteristic of the modern type that most directly represents the type used in ancient Roman inscriptions