The word "GAMMAIR" is spelled with a "G" rather than a "J" sound because it is derived from the Greek letter gamma, which is pronounced as a hard "G". The "AIR" at the end is spelled as it sounds, using the long "A" sound followed by the "R" sound. The IPA phonetic transcription for "GAMMAIR" is /ɡæmˌɛr/, with the symbol "ɡ" representing the hard "G" sound and the symbol "æ" representing the long "A" sound.