Correct spelling for the English word "downier" is [dˈa͡ʊnɪə], [dˈaʊnɪə], [d_ˈaʊ_n_ɪ__ə] (IPA phonetic alphabet).
The word "downier" is derived from the root word "downy", which originates from Middle English and Old English. The term "downy" refers to something that is soft, fluffy, or covered in fine feathers or hair. The suffix "-ier" is added to "downy" to form the comparative form, indicating that something is more downy or has more down-like characteristics.