Gregory's Server@simon_lucy
Americans who live within a day's drive of Worcester, Massachusetts* pronounce it "Wustah" because of course they do and just try stopping them.
And, as British place names migrated westward and got recycled in different states, the little Worcester clones in Ohio and Iowa (and probably other places) became Woosters.
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* Except people in Connecticut, who go out of their way to pronounce it "Wurr-sturr," to piss off their neighbors in Massachusetts.