syllabic 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 3 recorded opposites are accentual, quantitative, nonsyllabic.
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.
(of verse) having lines based on number of syllables rather than on rhythmical arrangement of stresses or quantities
consisting of a syllable or syllables
(of speech sounds) forming the nucleus of a syllable
“the syllabic `nl' in `riddle'”
2 of the 5 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for syllabic.
Synonyms, antonyms and the broader and narrower relations for syllabic come from Princeton University’s WordNet. Full sources and licences.