Correct spelling for the English word "Truncheonser" is [tɹˈʌnt͡ʃənsə], [tɹˈʌntʃənsə], [t_ɹ_ˈʌ_n_tʃ_ə_n_s_ə] (IPA phonetic alphabet).
A person armed with a truncheon.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.