The spelling of the word "cocis" is challenging due to its uncommon structure. The word is usually pronounced as /ˈkoʊsɪs/ in IPA phonetic transcription. The first syllable "co" is pronounced like "koh", followed by the second syllable "cis", pronounced like "sis". The letters "c" and "s" in "cocis" represent the consonant sounds, whereas the vowel sound "o" is represented by the letter "o". In conclusion, the spelling of the word "cocis" might seem puzzling, but its pronunciation can be accurately represented through IPA transcription.