Pronunciation: [ɪnˈɪʃə͡lə] (IPA)
Correct spelling for the English word "initialler" is [ɪnˈɪʃə͡lə], [ɪnˈɪʃələ], [ɪ_n_ˈɪ_ʃ_əl_ə] (IPA phonetic alphabet).