The spelling of the word "JEXCA" can be explained using the International Phonetic Alphabet (IPA). The first letter, "J," is pronounced as a palatal approximant, represented by the symbol /j/. The second letter, "E," is pronounced as a mid-front vowel, represented by the symbol /ɛ/. The third letter, "X," is pronounced as a voiceless velar fricative, represented by the symbol /x/. The fourth letter, "C," is pronounced as a voiceless palatal plosive, represented by the symbol /c/. The final letter, "A," is pronounced as an open front unrounded vowel, represented by the symbol /a/.