The spelling of the word "quoc" follows the English pronunciation rules. It is pronounced as /kwɒk/ [kwok], with the "qu" digraph pronounced as /kw/. The letter "o" is pronounced as a short "o" sound /ɒ/, and the letter "c" is pronounced as /k/. Therefore, the correct spelling of the word "quoc" reflects its English phonetic transcription and should be written accordingly. The word "quoc" does not have a widely recognized definition, and its usage may vary depending on the context.