Pronunciation: [ˈɛfjuːˌə͡ʊ] (IPA)
Correct spelling for the English word "EFUO" is [ˈɛfjuːˌə͡ʊ], [ˈɛfjuːˌəʊ], [ˈɛ_f_j_uː_ˌəʊ] (IPA phonetic alphabet).
Correct spelling for EFUO