The correct spelling of the word "Shoeinghorn" is [ˈʃuːɪŋhɔːn]. The first syllable "shoe" is spelled as it sounds, with the "oe" representing the long "u" sound. The second syllable "ing" is spelled with an "i" and "ng" to represent the "ing" sound. The final syllable "horn" is also spelled as it sounds, with the "h" being silent. A shoeing horn is a tool used by farriers to help fit shoes onto horses' hooves.