Correct spelling for the English word "sonnetecr" is [sˈɒnɪtˌɛkə], [sˈɒnɪtˌɛkə], [s_ˈɒ_n_ɪ_t_ˌɛ_k_ə] (IPA phonetic alphabet).
A composer of sonnets or small poems-usually in contempt.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.