The spelling of the word "bills coo" may seem confusing at first glance, but it can be broken down using the International Phonetic Alphabet (IPA) phonetic transcription. "Bills" is pronounced as /bɪlz/, with a short "i" sound at the beginning, followed by the "l" and "z" sounds. "Coo" is pronounced as /kuː/, with a long "u" sound and a soft "k" sound at the beginning. Together, "bills coo" can be pronounced as /bɪlz kuː/, with emphasis on the "koo" for proper enunciation.