Pronunciation: [fˈɜːta͡ɪlz] (IPA)
Correct spelling for the English word "fertiles" is [fˈɜːta͡ɪlz], [fˈɜːtaɪlz], [f_ˈɜː_t_aɪ_l_z] (IPA phonetic alphabet).
Correct spelling for fertiles