The spelling of the word "palliest" follows the typical English spelling rules. It is derived from the adjective "pale", which is spelled /peɪl/. When adding the comparative suffix "-er", it becomes "paler" /ˈpeɪ.lər/. The superlative suffix "-est" is then added to create "palest" /ˈpeɪl.ɪst/. To indicate the pronunciation of the word, the International Phonetic Alphabet (IPA) symbols are used. The first syllable is pronounced, /peɪl/, followed by /i/ and /st/ in the second syllable. Thus, the correct spelling of the word is "palest".