The correct spelling of the word "slughorn" is actually "slughorn." The pronunciation of this word can be represented in IPA phonetic transcription as /ˈslʌɡhɔːrn/. The initial "s" is followed by the "luh" sound represented by the letters "lu" and the "g" sound represented by the letter "g." The final syllable is pronounced with an "or" sound represented by the letters "or" and the silent "h" is present as well. This unique spelling and pronunciation make it a distinctive word in the English language.