hypercatalectic has no recorded synonym. 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. Its 2 recorded opposites are acatalectic, catalectic.
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.
(prosody) a line of poetry having an extra syllable or syllables at the end of the last metrical foot
(verse) having an extra syllable or syllables at the end of a metrically complete verse or in a metrical foot
Synonyms, antonyms and the broader and narrower relations for hypercatalectic come from Princeton University’s WordNet. Full sources and licences.