The spelling of the word "Fithul" can be explained using the International Phonetic Alphabet (IPA) phonetic transcription. The word is pronounced as /ˈfɪθ(ə)l/, with the stressed syllable being the first one. The opening sound is a voiceless bilabial fricative /f/ followed by the vowel sound /ɪ/. The next two sounds are voiceless dental fricatives /θ/ and /l/ respectively. The spelling of the word "Fithul" doesn't follow the common English spelling patterns but can be pronounced accurately using IPA.