R.C. vs popish

R.C. and popish both are adjectives.

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

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

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

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