British English speaker here - I'm having difficulty identifying the word you're referring to here. Or are you referring more to definition and statistical presence in common usage?
Since "gotten" isn't in the list, I'm going with "someplace". It even seems unusual to me as an American, as I would write either "some place" or "somewhere". If the phrase is also unusual in British English, that's definitely something I had never noticed.
Is "gotten" the only word that exists in American English but not British English (apart from "someplace")? Your comment strikes me as trying to bring up a pet hate in an unrelated conversation.
I'm sure it's not the only one, but it's the one that immediately came to mind. I thought it might be in the list because it's close to a foundational word in American English.
Sorry that you chose to read my comment as hatred. Yeah, that's not a real apology.