Esspee
Personally I hate the use of the word toilet when the correct term is lavatory. Not an Americanism but a twee term used by people who think toilet is polite - it is not. As my mother would say, if it's the word used by the Queen and her family then it must be correct. They say lavatory.
I do not like the word toilet either but I would never claim that lavatory is the “correct” word! Who says ? Why is it correct if the queen says it ??



There aren't that many words that are too confusing between the variations in the languages, but chips/crisps is one that comes to mind.
