The spelling of the word "Acheson" is influenced by its pronunciation, which is ˈeɪtʃɪsən. The initial sound is represented by the letter "A," followed by the digraph "ch" which represents the voiceless velar fricative sound /x/. The third sound is the short vowel sound /ɪ/, followed by another voiceless sound /s/. Finally, the word ends with the schwa sound /ən/. While the spelling of Acheson might be confusing, understanding the IPA phonetic transcription can help you to spell it correctly.