The spelling of the word "CMARVS" requires knowledge of the International Phonetic Alphabet (IPA). This word corresponds to the Latin spelling of the Roman god Mars. In IPA, the pronunciation of each letter is as follows: /k/ for C, /m/ for M, /a/ for A, /r/ for R, /v/ for V, and /s/ for S. Therefore, the correct pronunciation of CMARVS is /kmarvs/. Understanding the IPA can help individuals accurately spell and pronounce words from different languages.