"Hythergraph" is not a commonly used word, and its spelling may seem confusing. However, its phonetic transcription can help explain the spelling. The word is pronounced as "h-eye-th-er-gr-ah-f", with the emphasis on the second syllable. The "h" and "y" combine to make a sound similar to the "high" in "highway", while the "th" is pronounced as in "think". The "er" is a schwa sound, and the final "graph" is pronounced as in "autograph". Overall, the phonetic transcription shows that "hythergraph" is spelled based on the sounds of its syllables.