Pronunciation: [mˈə͡ʊst smˈatəɹi] (IPA)
Correct spelling for the English word "most smattery" is [mˈə͡ʊst smˈatəɹi], [mˈəʊst smˈatəɹi], [m_ˈəʊ_s_t s_m_ˈa_t_ə_ɹ_i] (IPA phonetic alphabet).