The spelling of the word "Reaia" can be explained using the International Phonetic Alphabet (IPA). The first letter, "R," represents a voiced alveolar fricative sound in IPA (/ɹ/), followed by the second letter, "e," which represents a mid-front unrounded vowel (/e/). The third and fourth letters, "ai," together represent a diphthong, specifically a mid-front unrounded vowel (/e/) followed by a high-front unrounded vowel (/i/). The final letter, "a," represents a near-open front unrounded vowel (/æ/). Therefore, the correct pronunciation of "Reaia" in IPA is /ɹeɪæ/