The spelling of the word "FASTERMANS" follows the rules of English phonetics, where each letter represents a specific sound. The word is pronounced /ˈfæstərmənz/, with the stress on the first syllable. The phonetic transcription shows that the first vowel is pronounced as /æ/, the second as /ə/, and the third as /ə/. The consonant sounds are also represented accurately by the letters in the word. Therefore, correct spelling of the word is important to accurately represent its pronunciation.