The spelling of the word "casler" is not a commonly used word in English. However, based on its phonetic transcription, it appears to be pronounced as /ˈkæz.lər/. The first syllable is stressed, and the ‘c’ is pronounced as a ‘k.’ The second syllable has a slight ‘s’ sound, which is represented by the ‘c.’ The final syllable is pronounced as ‘ler,’ with a schwa sound. Overall, the spelling of the word "casler" accurately represents its pronunciation.