rubricate has 1 distinct synonym spread across 1 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
place in the church calendar as a red-letter day honoring a saint
“She was rubricated by the pope”
furnish with rubrics or regulate by rubrics
“the manuscript is not rubricated”
decorate (manuscripts) with letters painted red
“In this beautiful book, all the place names are rubricated”
Synonyms, antonyms and the broader and narrower relations for rubricate come from Princeton University’s WordNet. Full sources and licences.