The word "NCOBA" is pronounced as /ɛnkoʊbɑː/. The letter sequence "NC" represents the sound /nk/ at the beginning of the word. The letter "O" is pronounced as /oʊ/ and the letter "B" represents the sound /b/. Lastly, the letter "A" is pronounced as /ɑː/. This spelling of the word "NCOBA" follows the conventions of English grapheme-phoneme correspondence, where each letter or letter sequence represents one or more sounds in the spoken language.