Pants - UK underwear, US trousers
Rug - UK blanket, US carpet. Though I’ve been told elsewhere that the UK usage is outdated now, not really used any more. Still, I seem to come across it in mysteries all the time. When they pull a rug out o’ the boot. (And not one of those with a body rolled inside)
Purse - UK coin purse/ladies wallet, US handbag