The spelling of the word "ARCCHT" can be explained using IPA phonetic transcription. The first sound is "ɑː", commonly represented by the letter "a", which is then followed by the "r" sound "ɹ". The next two sounds are the "k" sound "k" and the "t" sound "t". The last two sounds are both "ch" sounds "tʃ". Therefore, the correct spelling of this word is "ARCHT", with the first "c" being a mistakenly added letter. Phonetic transcriptions can help clarify the spelling and pronunciation of words.