The spelling of the word "FFHTNET" is quite unique and requires an understanding of the International Phonetic Alphabet (IPA) to explain it. The first two letters "FF" represent the voiceless labial-velar fricative /f/. The following "HT" is pronounced as the voiceless postalveolar fricative followed by the voiceless dental fricative, /ʃt/. Finally, the last three letters "NET" represent the voiced alveolar nasal followed by the voiced dental nasal, /nɛt/. In short, "FFHTNET" is a combination of various consonant sounds with no vowels.