The spelling of the word "concertizer" can be explained using IPA phonetic transcription. This word is pronounced as /kən'sərtaɪzər/, with emphasis on the second syllable. The first syllable is pronounced with short "uh" sound, followed by a stressed "er" sound in the second syllable. The "t" is pronounced with a soft "t" sound and the "z" is pronounced with a "z" sound. "Concertizer" can be spelled correctly by breaking it down into its phonetic sounds and understanding the correct pronunciation of each sound.