The spelling of the word "Thalessa" can be explained using the International Phonetic Alphabet (IPA). The first syllable, "thal", is pronounced as /θæl/, with the "th" making a voiced dental fricative sound and the "a" pronounced as a short vowel sound. The second syllable, "essa", is pronounced as /ɛsə/, with the "e" making a short vowel sound and the "s" making an unvoiced fricative sound. Overall, "Thalessa" is a unique and phonetically complex name with a memorable sound.