papist vs R.C.

papist is a noun but R.C. is not a noun.

Word	Noun	Adjective	Verb	Adverb
papist	Yes	Yes	No	No
R.C.	No	Yes	No	No

As adjectives, papist and R.C. are synonyms defined as:

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

papist (noun)	R.C. (noun)
an offensive term for Roman Catholics; originally, a Roman Catholic who was a strong advocate of the papacy

papist (adjective)	R.C. (adjective)
of or relating to or supporting Romanism	of or relating to or supporting Romanism