The spelling of the word "more mullish" can be explained through phonetic transcription. The initial sound "m" is represented by the IPA symbol /m/, followed by the vowel sound "o" represented by /ɔ/. The word then has the sound "r" represented by /r/ before the diphthong sound "ei" represented by /eɪ/. The final sound is the voiceless fricative "sh" represented by /ʃ/. Therefore, the correct spelling of the word is "more mullish," which means stubborn or difficult to manage.