The correct spelling of the word "un stop" is actually "unstoppable". In IPA phonetic transcription, it is pronounced as /ʌnˈstɒpəbəl/. The "un" prefix means "not", and the word "stop" is combined with the suffix "-able" to form the adjective "unstoppable", meaning unable to be stopped. It is important to use correct spelling in written communication to ensure that messages are conveyed clearly and effectively.