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WordNet records no synonym and no antonym for diphthong. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another
Synonyms, antonyms and the broader and narrower relations for diphthong come from Princeton University’s WordNet. Full sources and licences.