The word "amexes" is the plural form of "amex," which is an informal term for an American Express credit card. The spelling of "amexes" is derived from its singular form, as it follows the typical English pluralization rule of adding "-es" to words ending with "-x." In IPA phonetic transcription, the word is pronounced as /ˈæmɛksɪz/, with emphasis on the first syllable and a soft "s" sound at the end.