The spelling of the phrase "most murder" may seem perplexing, as one might expect it to be spelled "most murderous." However, the explanation lies in the word "most," which is pronounced /moʊst/ with a long o sound. The word "murder," on the other hand, is pronounced /ˈmɜrdər/ with a short u sound. The two words simply do not have the same vowel sound, and therefore cannot be combined into "most murderous." Instead, the proper phrase is "most murder," pronounced /moʊst ˈmɜrdər/.