The word "accentuable" is spelled with the letter "u" after the "n" because it follows the rule of adding "u" to "n" to maintain the /ŋ/ sound. The IPA phonetic transcription for "accentuable" is /əkˈsɛn.tju.ə.bəl/. The stress falls on the second syllable, with a schwa sound at the beginning and the ending "-able" indicating the ability to be accentuated. The correct spelling of words like "accentuable" is important to ensure clear communication and avoid confusion among readers and listeners.