Correct spelling for the English word "wartworth" is [wˈɔːtwɜːθ], [wˈɔːtwɜːθ], [w_ˈɔː_t_w_ɜː_θ] (IPA phonetic alphabet).
A plant having a warty surface.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.