"The United States and Great Britain are separated by a common language." 
George Bernard Shaw

General Expressions

American English

British English

Elevator

Lift

Apartment

Flat

Can

Tin

Hood (car)

Bonnet

Trunk (car)

Boot

Restroom

Loo

Table napkin

Serviette

Subway

Underground

Television

Telly

French fries

Chips

Pharmacy

Chemist

Cookies

Biscuits

Period (grammar)

Full stop

Truck

Lorry