accentual 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 quantitative, syllabic.
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 a metric system based on stress rather than syllables or quantity
“accentual poetry is based on the number of stresses in a line”
1 of the 2 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for accentual.
Synonyms, antonyms and the broader and narrower relations for accentual come from Princeton University’s WordNet. Full sources and licences.