Pronunciation: [hˈadəst ˌɒn kˈɑːpɪt] (IPA)
Correct spelling for the English word "haddest on carpet" is [hˈadəst ˌɒn kˈɑːpɪt], [hˈadəst ˌɒn kˈɑːpɪt], [h_ˈa_d_ə_s_t ˌɒ_n k_ˈɑː_p_ɪ_t] (IPA phonetic alphabet).