The word "reith" is not a commonly used word, and its spelling may seem confusing at first glance. However, using the International Phonetic Alphabet (IPA) can help explain its pronunciation and spelling. The IPA transcription of "reith" is /reɪθ/. This shows that the first sound is a long "a" sound, followed by a "th" sound. Therefore, the correct spelling of "reith" takes into account these sounds, resulting in an unusual spelling that may not follow traditional phonetic rules.