Correct spelling for the English word "Controverser" is [kˌɒntɹəvˈɜːsə], [kˌɒntɹəvˈɜːsə], [k_ˌɒ_n_t_ɹ_ə_v_ˈɜː_s_ə] (IPA phonetic alphabet).
A disputant.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.