Your Wordbook .co.uk (& UK) depicting British English as a domain/ wordbook.ownership
followed by two Americanisms (for appraisal) all in Jest my American Cousin I promise. I hope you see the Funny-side. I think most of us on this side of the water are more aware of the American sayings and spellings, purely because of it's more Global usage. But, I'm sure you can accept they can't sit right with the UK extension unless it's purely for an American Audience (Travel stuff etc)