Pronunciation: [d͡ʒˈa͡ɪzə] (IPA)
Correct spelling for the English word "GISER" is [d͡ʒˈa͡ɪzə], [dʒˈaɪzə], [dʒ_ˈaɪ_z_ə] (IPA phonetic alphabet).
Correct spelling for GISER