You could keep this one going for ages! You Americans do talk funny haha!
I'll give you a few:-
UK - Pants, US - Underwear
US - Pants, UK - Trousers
UK - Pavement, US - Sidewalk (We know it's on the side of the road, we know where that's where we walk!)
US - Warfighters, UK - Soldiers
UK - Bonnet, US - Hood
Language is a funny thing. In the UK you can drive 10 miles and names for everything change along with the accent so I'm only picking the common ones here.