Pronunciation: [ɹˈə͡ʊbə͡ʊstɹə] (IPA)
Correct spelling for the English word "roboastra" is [ɹˈə͡ʊbə͡ʊstɹə], [ɹˈəʊbəʊstɹə], [ɹ_ˈəʊ_b_əʊ_s_t_ɹ_ə] (IPA phonetic alphabet).