The word "NONGSO" is a bit difficult to spell because it comes from a language with different phonetics. The IPA phonetic transcription for "NONGSO" is /nɔŋso/. The "N" is pronounced as /n/, the "O" sounds like /ɔŋ/ which is a combination of "o" and "ng" sounds, and "G" and "S" are pronounced as /g/ and /s/ respectively. Therefore, the correct spelling of "NONGSO" must include two "O"s and one "N", followed by a "G", "S", and "O".