The spelling of the word "lives day" can be explained using the International Phonetic Alphabet (IPA). The first word, "lives," is pronounced /laɪvz/. The "i" sound is pronounced as a long "a" sound, while the "v" represents the voiced labiodental fricative sound. The second word, "day," is pronounced /deɪ/. The "a" sound is pronounced as a long "e" sound, while the "y" represents the consonant sound /j/. So, the pronunciation of "lives day" is /laɪvz deɪ/.