The spelling of the word "PBRONZE" can be explained using the International Phonetic Alphabet (IPA). The letter "P" represents the voiceless bilabial plosive sound /p/, followed by the voiced bilabial fricative sound /β/ represented by the letter "B". The letter "R" represents the voiced alveolar trill /r/, while "O" represents the mid-back rounded vowel /o/. The letters "N" and "Z" represent the voiced alveolar nasal /n/ and voiced alveolar fricative /z/ respectively. Therefore, the IPA transcription of "PBRONZE" would be /pβrɒnz/.