The spelling of the word "Hilleri" can be best explained using the International Phonetic Alphabet (IPA) phonetic transcription. The first syllable, "Hil," is pronounced as /hɪl/, with a short 'i' sound. The second syllable, "le," is pronounced as /li/, with a long 'e' sound. The final syllable, "ri," is pronounced as /ri/ with a slight trill on the 'r' sound. Together, the pronunciation of "Hilleri" can be written as /hɪl-li-ri/.