paradigm has 4 distinct synonyms spread across 2 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.
systematic arrangement of all the inflected forms of a word
Synonyms, antonyms and the broader and narrower relations for paradigm come from Princeton University’s WordNet. Full sources and licences.
the class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another)
the generally accepted perspective of a particular discipline at a given time
“he framed the problem within the psychoanalytic paradigm”