The spelling of the word "CORIS" is straightforward when using the International Phonetic Alphabet (IPA). The first syllable is pronounced with the 'k' sound, followed by the long 'o' sound and the 'r' sound. The second syllable has the short 'i' sound and ends with the 's' sound. Therefore, the correct spelling of this word is "ko-ris." Using the IPA helps to accurately represent the pronunciation and ensure correct spelling, particularly for non-native speakers or people learning a new language.