The spelling of the word "most acervulus" can be a bit tricky, but it can be broken down using the International Phonetic Alphabet (IPA) transcription. "Most" is pronounced as /moʊst/, with the "o" sound being a diphthong, pronounced as /oʊ/. "Acervulus," on the other hand, is pronounced as /əˈsɜːrvjʊləs/. The stress falls on the second syllable, where the "e" sound is pronounced as /ɜː/. It is important to pay attention to the placement of stress and vowel sounds in order to spell the word accurately.