The spelling of the word "dummer" is commonly confused with its homophone "dumber." However, the correct spelling for the comparative form of "dumb" is "dumber," with a "b" in place of the "m." According to the International Phonetic Alphabet (IPA), "dummer" would be pronounced as /ˈdʌmər/, with the short "u" sound and a schwa sound at the end. It's important to pay attention to spelling and pronunciation to avoid confusion and potential miscommunication.