The word "staunchnesses" is spelled with 11 letters, including two pairs of double letters. The first double letter is "au", pronounced as /ɔː/, while the second double letter is "nn", pronounced as /n/. The final syllable of the word is "-ess", pronounced as /es/. The word is derived from "staunch", meaning loyal or unwavering, and the "-ness" suffix, indicating a state or quality. The plural form, "staunchnesses", refers to multiple instances of loyalty or steadfastness.