Pronunciation: [ɹˈe͡ɪnbə͡ʊ] (IPA)
Correct spelling for the English word "rainbo" is [ɹˈe͡ɪnbə͡ʊ], [ɹˈeɪnbəʊ], [ɹ_ˈeɪ_n_b_əʊ] (IPA phonetic alphabet).
Correct spelling for rainbo