The spelling of the word "onstott" can be explained using IPA (International Phonetic Alphabet) phonetic transcription. The first syllable of the word is spelled with the open-o sound (/ɑ/), followed by the "n" consonant (/n/). The second syllable features the "s" consonant (/s/) and the long "o" sound (/oʊ/). Lastly, the word finishes with the double "t" consonant sound (/t/). Therefore, the proper spelling of this word is "onstott" (/ɑnstɑt/).