The spelling of the word "blushest" follows the rules of English phonetics. It is pronounced as /ˈblʌʃɪst/, with the stress on the first syllable. The suffix "-est" is added to the end of the base word "blush" to indicate the "most" or "superlative" form of the adjective. While the word is grammatically correct, it is not commonly used in everyday speech or writing. Instead, speakers often use alternative expressions such as "most blushing" or "blushiest".