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This page is a spellcheck for word diphthongs. All Which is Correct spellings and definitions, including "Diphthongs vs diphthongs" are based on official English dictionaries, which means you can browse our website with confidence! Common searches that lead to this page: how to spell diphthongs, correct spelling of diphthongs, how is diphthongs spelled, spell check diphthongs, how do you spell diphthongs.