Pronunciation: [njˈuːklɪˌɒnɪksɪz] (IPA)
Correct spelling for the English word "nucleonicses" is [njˈuːklɪˌɒnɪksɪz], [njˈuːklɪˌɒnɪksɪz], [n_j_ˈuː_k_l_ɪ__ˌɒ_n_ɪ_k_s_ɪ_z] (IPA phonetic alphabet).
Correct spelling for nucleonicses