The spelling of the word "Lyssi" can be explained using the International Phonetic Alphabet (IPA). The first syllable "Ly" is pronounced as /laɪ/, where the "y" is a diphthong that combines the sounds of long "I" and short "I". The second syllable "ssi" is pronounced as /si/, where the "ss" represents a double "S" sound and the "i" is pronounced with a short "I" sound. Overall, the pronunciation of "Lyssi" is /laɪsi/. Proper spelling is essential in conveying accurate pronunciation.