rubric has 3 distinct synonyms spread across 2 of its 7 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.
an authoritative rule of conduct or procedure
directions for the conduct of Christian church services (often printed in red in a prayer book)
a heading that names a statute or legislative bill; may give a brief summary of the matters it deals with
“Title 8 provided federal help for schools”
category name
“it is usually discussed under the rubric of `functional obesity'”
Synonyms, antonyms and the broader and narrower relations for rubric come from Princeton University’s WordNet. Full sources and licences.