The word "knoblock" is spelled with two silent letters, "k" and "b." The pronunciation of this word is [ˈnɑːblɑːk], the first syllable being stressed. The spelling of this word follows the common English spelling convention of words with silent letters, where certain letters within the word have no direct influence on its pronunciation. In the case of "knoblock", the letters "k" and "b" serve no phonetic purpose and are instead used to retain the word's origin and meaning.