They both speak English, but not necessarily use the same words. For example, British people call trucks "lorries". I think that's the right thing to say as well because I lived in England for few years. Well, anyway, I found some common and funny words which would make you laugh. I took most of the words from the "I hear America Talking", by Stuart Berg Flexner.
|Tower Block||High-rise Apartment|
|Note||Bill (paper money)|
|Fringe||Bangs (of hair)|
|Cash Desk||Checkout Counter|
|Polka Dots||Chocolate Chips|
|Candy Floss||Cotton Candy|
|Fascia (panel)||Dash (board)|
|Verge||Shoulder (of a road)|
|Patience||Solitaire (a card game)|
|Sponge Bag||Shaving Kit|
|Spanner||Wrench (tightening tool)|
|Grabage/Dust bin||Trash Can|
If you know any other words then please drop them in the comments.