The correct spelling of the word "galliest" is actually "galiest." The "l" and "i" switch places, which is known as a transposition error. This can happen when our brains process information too quickly and make a mistake in the order of letters. The correct pronunciation is /ˈɡeɪliəst/ with stress on the first syllable. When writing, it is important to double-check for transposition errors and to use phonetic transcription to ensure the correct spelling and pronunciation of words.