[bloak]

One of those words is not a word in British English.

(Why do I mention that? Firstly, perhaps it's a fun puzzle for non-native speakers of American English to identify the word. Secondly, it's surprising that a difference between British and US English is apparent in such a short list of such basic words, considering that sometimes it's possible to write whole paragraphs of English without it being apparent which variety of English is being used.)

[mrob]

That word is informal even in American English. It's less common in British English, but it's growing in popularity in both versions, and I wouldn't call it "not a word" even in British English. But I disagree with its inclusion in a first lesson, because its main use over the more common standard alternative (rot13: "fbzrjurer") is signaling casual speech.

Google Ngram Viewer lets you compare popularity of words in British vs. American English, so it's useful for investigating this.

https://books.google.com/ngrams

[spicerguy]

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?

[mcbits]

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.

[bmn__]

https://www.oxfordlearnersdictionaries.com/definition/englis...

[quietbritishjim]

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.

[mcbits]

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.

[spicerguy]

Thank you. Appreciated.

[pbhjpbhj]

I know the word you mean (no spoiler tag, so I won't say it, just 'it could almost be German' {to use a linguistic stereotype}) but I wouldn't recognise it as _not_ en-gb, just unusual.

I'm en-gb native.

[vivekf]

I would say 'much of'. I haven't seen it until I visited Americas.