Pronunciation: [ɡˈe͡ɪntɜːn] (IPA)
Correct spelling for the English word "gainturn" is [ɡˈe͡ɪntɜːn], [ɡˈeɪntɜːn], [ɡ_ˈeɪ_n_t_ɜː_n] (IPA phonetic alphabet).