The word "koas" is not a commonly used word in English. It is possible that this word may be a misspelling or a variation of the word "chaos". The correct spelling of the word "chaos" is pronounced as /ˈkeɪɑs/ in IPA phonetic transcription. The "ch" sound is pronounced like a "k" sound, followed by the "ay" sound, and ending with the "ahs" sound. It refers to a state of complete disorder and confusion.