To me, the word DRUTHERS is quite common in the US; my laptop dictionary marks it as "North American informal." That seems to be reason enough to omit it, as I infer from ther subtext of more than a few of the comments above. I have no problem with removing all North American informal words, as long as all UK informal words, Australian informal words, New Zealand informal words, and all informal words used in whatever community of native English speakers are likewise removed.