That would be 'cop', used as a very informal reference to a policeman.
level crossing = railroad crossing
NO
The U.S. ambassador to Britain during the Civil War was Charles Francis Adams. His counterpart, the British Minister (Ambassador) to the U.S. was Richard Bickerton Pemell Lyons, the First Viscount Lyons.
It's the same as in US English.
Had got (British) / gotten (US)
No Amateur Golfer has ever won The Masters at Augusta National.
The word "cleaner" (noun, adjective) is both British and US English. The noun "cleaner" (cleaners) has the US synonym "laundry."
Bobby V's real name is Bobby Wilson.
Airplane. We speak English in the US. The British spell it 'aeroplane'.
A British billion is equal to an American billion in modern use.(Formerly, a British billion used to be equal to a US Trillion)
The correct spelling is color (US English) or colour (British English)
Colonisation or colonization is one possiblility