Pronunciation: [ɡjˈuːkɑː] (IPA)
Correct spelling for the English word "GUCAA" is [ɡjˈuːkɑː], [ɡjˈuːkɑː], [ɡ_j_ˈuː_k_ɑː] (IPA phonetic alphabet).
Correct spelling for GUCAA